Administrative Procedure Act Article 20

The term "party " used in this Act denotes the following persons:1. An applicant and the adverse party to an application;2. A person subject to the administrative disposition rendered by an administrative authority; 3. The opposite party to an administrative contract signed with an administrative authority;4. A person for whom administrative guidance is employed;5. A person filing a petition with an administrative authority; and 6. Any other person intervening into administrative procedures under this Act.
中文原文 行政程序法第20條
本法所稱之當事人如下︰一、申請人及申請之相對人。
二、行政機關所為行政處分之相對人。
三、與行政機關締結行政契約之相對人。
四、行政機關實施行政指導之相對人。
五、對行政機關陳情之人。
六、其他依本法規定參加行政程序之人。

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