クイックスタート
このガイドでは、LastPassのすべての機能について説明します。
- はじめる — Create your LastPass account and install the app
- パスワード管理の使い方 — Keep every login inside one encrypted vault
- How to Use User-Friendly Plans — Match LastPass to one person, a family, or a small business
- パスワードジェネレーターの使い方 — Create long, random passwords for every new account
- 多要素認証（MFA）の使い方 — Add a second login check to your LastPass account
- ダークウェブ監視の使い方 — Get alerts when your email shows up in a breach
- パスワードなしのVaultログインの使い方 — Unlock your vault with a phone tap instead of typing
- 保存と自動入力の使い方 — Save logins once and fill them on every website
- パスワード共有の使い方 — Share logins with teammates without ever revealing them
所要時間： 各作品につき5分
このガイドには以下の内容も含まれています。 プロのヒント | よくある間違い | トラブルシューティング | 価格 | 代替案
このガイドを信頼する理由
I have used LastPass for over two years across a computer, a phone, and a team account.
Every screen below comes from my own vault, not vendor marketing.
LastPass is one of the best known パスワードマネージャー apps on the market.
Most people save a few logins and stop there.
This beginner’s guide shows how to use LastPass properly, feature by feature.
LastPassチュートリアル
This How to use LastPass tutorial walks through password management, sharing, and 安全 settings in order.
ラストパス
Stop reusing the same three passwords everywhere. LastPass saves every login to an encrypted vault and fills it for you on any device. Every paid plan starts with a free trial, with no credit card required.
LastPass の利用開始
Before touching any feature, finish this one-time setup.
約3分かかります。
Here is how my own first hour with the app went:
それでは、各ステップを順を追って見ていきましょう。
ステップ1：アカウントを作成する
Go to the LastPass website and click Get LastPass Free.
Enter your email, then create a master password you will actually remember.
お使いのデバイスは、メールアドレスとマスターパスワードを使用して、パスワードをローカルで暗号化およびハッシュ化します。
✓ チェックポイント: チェックしてください 受信トレイ 確認メールについて。
ステップ2：アプリとブラウザ拡張機能をインストールする
Install the LastPass browser extension on Chrome, Firefox, Edge, or Safari.
It runs on Windows, macOS, and Linux computers.
Then download the app for iOS or Android on your mobile device.
✓ チェックポイント: The LastPass icon now sits in your browser toolbar.
ステップ3：初期設定を完了する
Set a recovery phone number during setup so you can regain access if you forget your master password.
LastPassとの競合を避けるため、ブラウザに内蔵されているパスワードマネージャーを無効にしてください。
Then import saved logins from that browser in one click.
✅ 完了: Your new account is ready for every feature below.
How to Use LastPass Password Manager
パスワード管理 keeps every login inside one encrypted vault instead of scattered notes.
以下に、その使用方法をステップごとに説明します。
Step 1: Open Your LastPass Vault
Click the LastPass browser extension icon in your toolbar.
Choose Open My Vault to see every saved item.
Step 2: Add a Site
Click Add Item, then pick Password.
Enter the website URL, your username, and the actual password.
これがその様子です。
✓ チェックポイント: The new entry appears at the top of your vault list.
Step 3: Sort Items Into Folders
Group work, personal, and finance credentials into separate folders.
✅ 結果: Every login now lives in one encrypted vault you control.
💡 プロのヒント: Use folders in LastPass to categorize your credentials for better management as your vault grows.
How to Use LastPass User-Friendly Plans
ユーザーフレンドリーなプラン let you match LastPass to one person, a family, or a 中小企業.
以下に、その使用方法をステップごとに説明します。
Step 1: Start a Free Trial
LastPass offers a free trial for all of its paid plans, with no credit card required.
No payment details are needed to test every feature.
Step 2: Compare the Tiers
Premium suits one person, while Families gives each member an independent, encrypted password vault.
これがその様子です。
✓ チェックポイント: Your chosen plan shows as active inside account settings.
Step 3: Decide Before the Trial Ends
Skip the paid plan and your account converts to LastPass Free without losing stored データ.
✅ 結果: You sit on the tier that fits how many users you cover.
💡 プロのヒント: LastPass Free has a limit of one device type, either mobile or computer, so choose carefully.
LastPassパスワードジェネレーターの使い方
パスワード ジェネレータ builds long, complex passwords whenever you create or change a password.
以下に、その使用方法をステップごとに説明します。
ステップ1：ジェネレーターを開く
Click the extension icon and pick Generate Secure Password.
Step 2: Set Length and Characters
Drag the slider to at least 16 characters and include symbols.
これがその様子です。
✓ チェックポイント: A fresh random string appears in the preview box.
Step 3: Save It to Your Vault
Click Fill Password, then accept the save prompt on the site.
LastPass synchronizes passwords across all devices, so your phone updates within seconds.
✅ 結果: That account now runs on one of the strong, unique passwords LastPass built for you.
💡 プロのヒント: Replace weak passwords first — your Security Dashboard lists every reused login in one place.
LastPassの多要素認証（MFA）の使い方
多要素認証（MFA） adds two-factor authentication to your LastPass account login.
以下に、その使用方法をステップごとに説明します。
ステップ1：アカウント設定を開く
Go to Account Settings, then open the Multifactor Options tab.
Step 2: Enroll an Authenticator
Pick LastPass Authenticator and click Enroll to show a QR code.
これがその様子です。
✓ チェックポイント: The app on your phone now lists your LastPass account.
Step 3: Save Your Recovery Codes
Store the one-time recovery key offline, never inside the vault itself.
✅ 結果: A stolen master password alone can no longer open your vault.
💡 プロのヒント: You should always still use multi-factor authentication even with a password manager running.
LastPassを使ったダークウェブ監視の方法
ダークウェブモニタリング watches breach dumps and warns you when your email appears.
以下に、その使用方法をステップごとに説明します。
ステップ1：セキュリティダッシュボードを開く
Click Security Dashboard in the left sidebar of your vault.
Step 2: Add Your Email
Enter every email you use for logins, then confirm ownership.
これがその様子です。
✓ チェックポイント: Monitoring shows as active beside each address.
ステップ3：アラートへの対応
Change any exposed password straight away using the generator.
✅ 結果: You hear about a leak before anyone uses those credentials.
💡 プロのヒント: Regularly monitor your Security Dashboard in LastPass to check password health and breach alerts.
LastPassのパスワードレスVaultへのログイン方法
パスワードレスVaultログイン opens your vault with a phone tap instead of typing.
以下に、その使用方法をステップごとに説明します。
Step 1: Register the Authenticator
Install the LastPass Authenticator app on your mobile device and pair it.
Step 2: Turn On Passwordless
Inside account settings, switch Passwordless Vault Login to on.
これがその様子です。
✓ チェックポイント: The login screen now shows a Use Authenticator button.
Step 3: Approve the Push
Tap Approve on your phone to unlock the vault.
✅ 結果: You sign in without typing your master password on a shared computer.
💡 プロのヒント: Keep your master password memorised anyway — you still need it after a phone reset.
LastPassの保存と自動入力の使い方
保存して自動入力する saves login credentials to an encrypted vault and fills them for you.
以下に、その使用方法をステップごとに説明します。
ステップ1：自動入力機能を有効にする
Open extension settings and enable autofill for logins and forms.
Step 2: Save Your Next Login
Sign in anywhere, then accept the LastPass save prompt.
これがその様子です。
✓ チェックポイント: The site appears in your vault under All Items.
Step 3: Fill Other Form Fields
LastPass also fills addresses and payment card information from your profile.
✅ 結果: Signing in takes one click on any website you have saved.
💡 プロのヒント: LastPass requires a device running iOS 16 or later for autofill, so check AutoFill & Passwords settings.
LastPassのパスワード共有機能の使い方
パスワードの共有 lets you securely share passwords, files, and sensitive documents while keeping control.
以下に、その使用方法をステップごとに説明します。
ステップ1：共有センターを開く
Sharing passwords over email leaves them sitting in someone’s inbox forever.
Click Sharing Center in your vault sidebar instead.
Step 2: Create a Shared Folder
Add shared folders for each team, then drop items inside.
これがその様子です。
✓ チェックポイント: Members see shared credentials appear inside their own vault.
ステップ3：権限を設定する
Decide whether recipients see the actual password or only autofill it.
✅ 結果: Your team works from shared credentials without anyone emailing them.
💡 プロのヒント: A LastPass Teams account gives a 中小企業 one administrator view over every shared folder.
LastPassのプロ向けヒントとショートカット
After two years of managing passwords here, these habits save me the most time.
キーボードショートカット
| アクション | ショートカット |
|---|---|
| Open your vault | Ctrl + Alt + H |
| Generate a password | Ctrl + Alt + G |
| Search your vault | Ctrl + Alt + F |
| Fill the current login | Ctrl + Alt + A |
マック users swap Ctrl and Alt for Command and Option.
ほとんどの人が見逃す隠れた機能
- Secure notes: Store Wi-Fi keys, passport numbers, and licence codes beside your passwords.
- 緊急アクセス: Designate a trusted contact who can reach your vault if something happens to you.
- セキュリティダッシュボード: Spot weak passwords and reused logins in a single score.
LastPassでよくある間違いを避ける方法
Mistake #1: Reusing Your Master Password
❌ 間違い: Using your email password as your LastPass master password too.
✅ 右: Create a strong master password that is unique, complex, and memorable.
Mistake #2: Skipping Extra Security
❌ 間違い: Trusting one password to protect every account you own.
✅ 右: Turn on multi-factor authentication in account settings the day you sign up.
Mistake #3: Typing Your Master Password on a Lookalike Site
❌ 間違い: Entering credentials on a page you reached from an email link.
✅ 右: Check the footer — the real site reads Copyright 2026 LastPass US LP, All Rights Reserved.
LastPassのトラブルシューティング
Problem: Autofill Stopped Working on My Phone
原因： LastPass requires a device running iOS 16 or later for autofill.
修理： Review your device’s AutoFill & Passwords settings and pick LastPass there.
Problem: The Extension Will Not Sync New Passwords
原因： An outdated extension, or your browser’s own manager fighting for the same form.
修理： Open the LastPass community service status page first — it reads service operational when the servers are healthy.
Problem: I Forgot My Master Password
原因： LastPass uses a zero-knowledge encryption method, ensuring you are the only person who knows your master password.
修理： Use your recovery phone number or one-time recovery key to get back in.
Still locked out? Open Contact Us, log in to support, and reach a support agent.
📌 注記： Keep that recovery key somewhere offline before you need it.
LastPassとは何ですか？
ラストパス is a password manager that creates an encrypted vault for your login credentials.
Think of it like a safe that only opens with one key you memorise.
あなたの金庫は、あなただけが知っているマスターパスワードによって復号化されます。
こちらの簡単な概要をご覧ください。
主な機能は以下のとおりです。
- パスワード管理: One encrypted vault for every login you own.
- User-Friendly Plans: Personal, family, and small business tiers with a free trial.
- パスワードジェネレーター: Long, strong passwords built for any new account.
- Multifactor Authentication (MFA): A second check before your vault ever opens.
- ダークウェブモニタリング: Breach alerts tied to your email addresses.
- パスワードなしの保管庫ログイン: Phone approval instead of typing anything.
- 保存と自動入力： Stored credentials filled on every website you visit.
- パスワード共有： Send logins to teammates without exposing them.
Setting up a LastPass account may take a bit of time, since you have to gather every account and password you already use.
詳細なレビューについては、こちらをご覧ください。 LastPassのレビュー.
LastPassの料金
Here is what LastPass costs in 2026:
| プラン | 価格 | 最適な用途 |
|---|---|---|
| プレミアム | 月額3.00ドル | One person across unlimited devices |
| 家族 | 月額4.00ドル | Six members with separate vaults |
| チーム | 月額4.25ドル | Simple credential management for small teams |
| 仕事 | 月額7.00ドル | Managing passwords and access company wide |
| ビジネスマックス | 月額9.00ドル | Advanced protection and secure access |
無料トライアル: Every paid plan includes one, with no credit card required.
返金保証: 30 days on personal plans.
LastPass Free stays available, but it limits you to one device type.
💰 最もお得な価格: Families at $4.00/mo. — six personal vaults for a dollar more than Premium.
LastPassと代替サービスの比較
So how does LastPass compare with the rest of the password manager market?
この比較をご覧ください。
| 道具 | 最適な用途 | 価格 | 評価 |
|---|---|---|---|
| ラストパス | Autofill and team sharing | 月額3ドル | ⭐ 3.8 |
| 1パスワード | Polished apps and 旅行 モード | 月額2.99ドル | ⭐ 4.7 |
| パスパック | Small team credential sharing | 月額1.50ドル | ⭐ 4.2 |
| ダッシュレーン | 内蔵 VPN and dark web scans | 月額4.99ドル | ⭐ 4.5 |
| ノルドパス | Modern XChaCha20 encryption | 月額1.99ドル | ⭐ 4.6 |
| キーパーセキュリティ | Regulated and enterprise teams | 月額2.92ドル | ⭐ 4.6 |
| トータルパスワード | Quick setup on a budget | 月額1.99ドル | ⭐ 4.1 |
| ロボフォーム | Long form filling | 月額0.99ドル | ⭐ 4.4 |
| ビットワーデン | Open source and free forever | 月額0.83ドル | ⭐ 4.8 |
| プロトンパス | プライバシーを最優先するユーザー | 月額1.99ドル | ⭐ 4.5 |
| スティッキーパスワード | One-off lifetime licence | 月額2.49ドル | ⭐ 4.3 |
おすすめ商品：
- 総合ベスト： 1Password — the most polished apps on every platform.
- ベスト予算： Bitwarden — open source with unlimited free devices.
- 初心者におすすめ： LastPass — the setup wizard explains each step.
- 中小企業に最適： Keeper Security — proper admin roles and 報告.
🎯 LastPassの代替品
LastPassの代替サービスをお探しですか？おすすめのサービスはこちらです。
- 🚀 1パスワード: Cleaner apps and Watchtower alerts, though it has no free tier at all.
- 💼 パスパック: Cheap shared folders built around team roles rather than personal vaults.
- 🌟 ダッシュレーン: Bundles a VPN with monitoring, which suits people who want one bill.
- 🔒 NordPass: Fast, minimal interface with strong encryption and a usable free plan.
- 🏢 キーパーセキュリティ: Compliance reporting and granular admin roles for larger organisations.
- ⚡ トータルパスワード: Straightforward vault and autofill without extras you will never open.
- 📊 ロボフォーム: Best-in-class form filling for anyone who completes long applications daily.
- 💰 ビットワーデン: Open source code, audited yearly, with a free tier that syncs unlimited devices.
- 🧠 プロトンパス： Swiss privacy, email aliases, and tight integration with Proton Mail.
- 👶 スティッキーパスワード: A lifetime licence option and local Wi-Fi sync for people who avoid the cloud.
全リストについては、こちらをご覧ください。 LastPassの代替 ガイド。
⚔️ LastPassとの比較
Here is how LastPass stacks up against each competitor:
- LastPass vs 1Password: 1Password wins on polish and trust. LastPass wins on price and its free plan.
- LastPass vs Passpack: Passpack is cheaper for teams. LastPass has far better browser autofill.
- LastPass vs Dashlane: Dashlane bundles more extras. LastPass costs less for the same core vault.
- LastPass vs NordPass: NordPass feels quicker. LastPass offers deeper sharing controls for teams.
- LastPass vs. Keeper Security: Keeper suits compliance-heavy firms. LastPass is simpler for a small business.
- LastPassとTotalPasswordの比較: TotalPassword is cheaper. LastPass has a bigger feature list and better apps.
- LastPass vs RoboForm: RoboForm fills forms better. LastPass handles sharing and monitoring better.
- LastPass vs Bitwarden: Bitwarden is cheaper and open source. LastPass has friendlier onboarding.
- LastPass vs Proton Pass: Proton Pass adds email aliases. LastPass has broader browser and app support.
- LastPassとSticky Passwordの比較: Sticky Password sells a lifetime licence. LastPass syncs more reliably.
今すぐLastPassを使い始めましょう
You now know how to use every major LastPass feature:
- ✅ パスワード管理
- ✅ User-Friendly Plans
- ✅ パスワードジェネレーター
- ✅ Multifactor Authentication (MFA)
- ✅ ダークウェブ監視
- ✅ パスワード不要の保管庫ログイン
- ✅ 保存して自動入力する
- ✅ パスワード共有
次のステップ： pick one feature and try it today.
Most people start with Save and Autofill.
5分もかかりません。
よくある質問
LastPassの使い方をステップバイステップで教えてください。
Create a LastPass account, set a master password, install the browser extension, then save logins to your vault. LastPass autofills those credentials next time you visit each site.
LastPassはもはや安全ではないのですか？
LastPass uses zero-knowledge encryption, so only you know your master password. Past breaches hurt trust, so enable multi-factor authentication and replace weak passwords stored before 2023.
なぜ人々はLastPassから離れていくのか？
Most cite the 2022 vault breach, the free plan limit of one device type, and rising prices. Others simply prefer cheaper rivals like Bitwarden.
LastPassとは何ですか？また、どのように機能しますか？
LastPass is a password manager. Your device encrypts and hashes your passwords locally using your email and master password, then syncs that encrypted vault across your devices.
LastPassは今でも利用する価値があるのか？
Yes, if you want autofill, secure notes, and shared folders in one app. Try the free trial first, with no credit card required, before paying.
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