Act I: Lieutenant Pinkerton, Making last-minute arrangements for his wedding, is shown through his new house overlooking the harbor of Nagasaki by Goro, the marriage broker, Three servants, including the maid Suzuki, are introduced.

• 第一幕：海军上尉平克顿来到他的新房子，为自己的婚礼作最后的安排。房子居高临下地俯览长崎港，媒人五郎带他各处看一遍。三个佣人拜见了新主人，其中有个使女名叫铃木。