A disposable medical device has a body (10, 10A, 10B) and a light assembly (20, 20A, 20B). The body (10, 10A, 10B) has a placement portion (13, 13A, 13B). The light assembly (20, 20A, 20B) is connected to the body (10, 10A, 10B) and has an outer casing (21, 21A, 21B), a lighting module (22), and a power supply module (23). The outer casing (21, 21A, 21B) is connected to the placement portion (13, 13A, 13B). The lighting module (22) has a luminous body (26, 26A, 26B) and a pressing-conductive arm (27, 27A). The pressing-conductive arm (27, 27A) is connected to the luminous body (26, 26A, 26B), and has an abutting portion (271, 271A, 271B) and a conductive portion (272). The power supply module (23) is connected to the lighting module (22) and the conductive portion (272).
