Deleting a space permanently removes the space and all of its contents. To delete a space you must be an administrator of the space.

 Deleting a space is permanent. If you're unsure, always create an XML backup of the space before proceeding. You can also choose to backup the attachments if you need to.

Once you've deleted the space, there is no way torestoreit unless you've made an XML space backup. 

SeeRestoring a Space.

スペースの削除方法

1. 

2. スペースを削除を選択します。
3. OK を選択します。