Constitution of the Republic of China (Taiwan) Article 55
The President of the Executive Yuan shall be nominated and, with the consent of the Legislative Yuan, appointed by the President of the Republic.If, during the recess of the Legislative Yuan, the President of the Executive Yuan should resign or if his office should become vacant, his functions shall be exercised by the Vice President of the Yuan, acting on his behalf, but the President of the Republic shall, within 40 days, request a meeting of the Legislative Yuan to confirm his nominee for the vacancy. Pending such confirmation, the Vice President of the Executive Yuan shall temporarily exercise the functions of the President of the said Yuan.
中文原文 中華民國憲法第55條
行政院院長由總統提名，經立法院同意任命之。
立法院休會期間，行政院院長辭職或出缺時，由行政院副院長代理其職務，但總統須於四十日內咨請立法院召集會議，提出行政院院長人選徵求同意。
行政院院長職務，在總統所提行政院院長人選未經立法院同意前，由行政院副院長暫行代理。
立法院休會期間，行政院院長辭職或出缺時，由行政院副院長代理其職務，但總統須於四十日內咨請立法院召集會議，提出行政院院長人選徵求同意。
行政院院長職務，在總統所提行政院院長人選未經立法院同意前，由行政院副院長暫行代理。