Regulations for Attendance by Proxies of Labor Union Members’ Meetings or Representative Meetings of Labor Union Members Article 6

When a labor union member or representative has signed in but has to leave before the end of the meeting, he (or she) may designate other member or representative to exercise his (or her) rights, however, such designated representatives shall not exceed one-third of those members or representatives required to attend in person, and shall record the time of his (or her) departure on the sign-in book.In case that members or representatives are exercising their rights of election or recall, once the chairperson of the meeting has announced the beginning of this procedure, any designation shall not be allowed.
中文原文 工會會員大會或會員代表大會委託出席辦法第6條
會員或會員代表於出席會議辦理簽到後,因故提前離席者,於不超過親自出席人數三分之一數額範圍內,得委託其他會員或會員代表行使其權利,並應於簽到簿註明離席時間。
會員或會員代表行使選舉或罷免權利,於會議主席宣布開始進行選舉或罷免程序時,即不得再行委託或受委託。

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