Regulations Governing the Detention of the Aliens Article 2

Alien detention shall be implemented in alien detention centers, temporary detention centers set up by the National Immigration Agency of the Ministry of the Interior (hereinafter referred to as the "National Immigration Agency"), or other proper locations designated by the National Immigration Agency under necessary circumstances (hereinafter referred to as "the detention center").
中文原文 外國人收容管理規則第2條
外國人收容管理,由內政部移民署(以下簡稱移民署)設置之收容所、臨時收容所或其他因必要情形指定之適當處所(以下簡稱收容處所)為之。

English translation for reference only; the Chinese text prevails. Not legal advice.