Code of Civil Procedure Article 55
Except as otherwise provided, an act conducted by a co-party or by the opposing party against one of the co-parties, and all matters concerning such co-party, will have no effect on the other co-parties.
中文原文 民事訴訟法第55條
共同訴訟中，一人之行為或他造對於共同訴訟人中一人之行為及關於其一人所生之事項，除別有規定外，其利害不及於他共同訴訟人。