PURPOSE: A dead man alarm system of a ship is provided to improve work efficiency by enabling a worker to know a normal state himself. CONSTITUTION: A transmission part(110,120) is carried with a worker. The transmission part wirelessly outputs a normal signal representing a normal signal. A receiver(130) receives a normal signal outputted from the transmission part. A controller(140) outputs a control signal if an interval which the receiver receives a normal signal is greater than predetermined time. An alarm generating part(150) generates an alarm according to a control signal outputted from the controller.
