From Joomla! Documentation

This page is a translated version of the page J4.x:Installing Joomla and the translation is 22% complete.
Outdated translations are marked like this.
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こちらは、Joomla 4がリリースされるまでの一時的なページです。それまではJoomla! 3.x インストールをご覧ください。


If you have not yet set up a hosting environment you need to do it now, either on a hosting service or your local computer. Read the Hosting Setup tutorial for details.

Also, there are some PHP settings that need to be sufficient for Joomla to install. The settings are usually in a php.ini or user.ini configuration file on the server. If you are on shared hosting, talk to your hosting service about how to change these settings if it is possible to do so. If working on a localhost, for example with XAMPP, or a VPS or dedicated host, you should not be restricted by these settings and can set them yourself.

The minimum values for the php.ini file are shown below:

  • memory_limit - 最小: 64M 推奨: 128M 以上
  • upload_max_filesize - 最小: 30M
  • post_max_size - 最小: 30M
  • max_execution_time: 推奨: 30

It is possible to work with lower values of upload_max_filesize and post_max_size but larger extensions will fail to upload and cause unpredictable problems.

Database Setup

If you have not yet set up a database do it now. It is covered for a hosting service in the Hosting Setup tutorial. There is also a Creating a Database for Joomla! tutorial that covers localhost and phpMyAdmin methods.

  1. データベースを作成する必要がある場合は、以下"Joomlaで使用するデータベースの作成"を最初に参照するか、スキップしてステップ #2へ進みます。
  2. 実際のJoomlaインストールを開始するときに必要な基本的なデータベース情報に注意する必要があります。
    • データベースの場所はlocalhostですか?またはdbserver1.yourhost.comなどの特定のホストのサーバーですか?
    • データベース名
    • データベースのユーザー名
    • データベースのユーザーパスワード


サーバーにJoomlaをインストールする前に、2つのタスクを完了する必要があります。まずJoomlaパッケージファイルをダウンロードする必要があります。 次に、Joomlaで使用するデータベースの準備が必要になります。

Joomla! パッケージファイルのダウンロードとアップロード


  1. ダウンロードしたJoomlaインストールパッケージをサーバーに移動します。FTP クライアントを使ってJoomla 4.x ファイルをサーバに転送してください。使用できるFTPクライアントについてはFTPクライアント一覧を参照ください。FTPクライアントの公式リリースを使用していることを確認してください。
ヒント - ダウンロードしたパッケージをサーバーに移動してから解凍れば、より簡単に実行できます。または、ローカルコンピューターでファイルを解凍してから、Joomlaインストールファイルをサーバーに移動することもできます。いずれにせよ、Joomlaインストールはサイトのルートで解凍する必要があります。


Stop hand nuvola.svg.png

The zip package files can be extracted directly on the host using various command line tools (e.g. unzip), which needs to be installed on the server. If your hosting service uses the admin tool cPanel, the Extract button can be pressed in the File Manager. Apart from that, the free third-party tool Akeeba Kickstart may also be used for this purpose. The unzipped files and directories will be placed in the current folder. Extraction on your local computer depends on your OS. Try a right-click and see if there is an extract menu. In this case your OS may put the files in a folder with the same name as the zip file. After extraction you may delete the zip file and rename the extraction folder to something short and suitable for use in a url.




https://www.yoursitename.com. Joomlaをローカルにインストールする場合は、 http://localhost/<Joomlaファイルへのパス> インストール画面が表示されます.

J4x Installation screen page 1.png

Joomla はブラウザの言語から言語を選択 フィールドを自動的に識別しようとします。必要に応じてこれを変更できます。





J4x Installation screen page 2.png

Fill in the following information.

  • Real Name: The name of the Super User. This is how Joomla will greet you when you log in.
  • Super User account username: The username for the Super User. Avoid using admin (a good Security measure) or use My Profile in the Administration interface to change it later.
  • Admin Password: Remember that a Super User has maximum control of the Site and Administrator interfaces, so use a difficult password. Use My Profile in the Administration interface to change it later.
  • Super User Email Address: The Super User email address. Enter a valid email in case you forget your password. This is the email address where you'll receive a link to change the Super User password.

When everything on the second page is completed, click the Setup Database Connection button to proceed.

Database Configuration

Enter the database information noted down when you created the database for this installation. You may also read or review Creating a Database for Joomla!.




For simplification, these instructions are a reference to installing with a MySQLi database. The instructions on the installation page are self explanatory, but here they are again:

  • Database Type: MySQLi is the common database used
  • Hostname Where your database is located. Common is localhost, even on hosting services. However, some hosts use a specific database server such as


  • Username: The username used to connect to the database
  • Password: The password for the database user (not your Administrator password)
  • Database Name: The name of the database
  • Table Prefix: This is generated automatically as a security feature. You can accept the randomly generated default or change it. Just don't forget to put the underscore character


at the end of the prefix.

  • Connection Encryption: specifies how the connection to the database should be encrypted. If you don't know - then it's best to stick to the default. However this allows enterprises that use one or two way authentication for the database connection to provide it.

All these choices and more can be edited on the Site Global Configuration page, under Server Options after the installation is completed. Note, you will break your installation if you change these settings after installation unless you have a complete copy of the current database being used by the Joomla installation. Common uses would be to update the username and password of the database or to complete a move of an existing installation to a new host with different parameters.

After you click the Install Joomla button, you should see the Joomla logo spinning. Once the installation completes, you should see the success page.

Finishing Up

Success and Finishing Up the Installation

Congratulations! Joomla! 4 is now installed.




If you want to start using Joomla right away without installing extra languages you can select Open Administrator to go to the Administrator Dashboard or select Open Site to go to the Site Home page.

You may see a section with recommended PHP settings.

  • Recommended Settings: These settings are recommended in your PHP configuration, but will not prevent Joomla! from being installed. You can refer to the above instructions on how they may be changed if there is a need to do so.

=== その他の言語のインストール ===

As part of the Joomla installation process you are given the opportunity to install additional languages before you complete the installation.

To do this select the Install Additional Languages button

This will take you to an extra installation page allowing you to select the languages you require.

==== 言語のインストール ====

A list of language packs is displayed.




Select up to 3 languages you wish to install. (More than 3 at once can cause timeout issues; you can install more later.)

Remember the following:

  • Language packs included in custom distributions will not be listed at this stage as they are already installed.
  • A version of the packs proposed will match the Joomla Major version (4.0.x, 4.1.x, etc.). The minor version of the pack may not correspond, e.g. you are installing version 4.0.3 and a 4.0.2 language pack is shown.
  • Unmatched language packs in the above example may have untranslated strings.
  • The unmatched language packs will be offered as an update when the packs are updated by the registered Translation teams. The available update will be shown in the Control panel as well as in Extensions Manager  Update. This behaviour is similar to Extensions Manager  Install Languages.

Click Next and a progress bar will be displayed while the language pack or packs are installed.

==== デフォルト言語の選択 ==== When the installation of the languages is complete you will now be presented with a similar Congratulations! Your Joomla site is ready. screen. The difference will be a list of the installed languages allowing you to select the default language for the Site and the Administrator interface.




  • Select the default language you wish to use.
  • When you have selected the default language, click the Set default language button to confirm.
  • A system message will be displayed confirming Joomla has set the default Administrator and Site language. That message can be closed.


You can now can navigate to the Administrator Dashboard. Log in by selecting Open Administrator or go right to your site Home page by selecting Open Site.

== Related Information ==