PURPOSE: To cause even a person having a bradyacusia and a sleeping person to speedly execute a retreat by switching a vibrating unit driving signal to the vibration of a waveform which is sufficiently large or impactful at the time of an emergency.

CONSTITUTION: To a human body mounting body 20 such as a bed or floor, etc., the vibrating unit to generate a mechanical vibration by receiving a low frequency signal is fitted, and a control is executed so as to give the low frequency signal from an acoustic device, a sound sleep signal 12, an alarming signal 14 and an emergency signal 15 through a control circuit 11 and a selector circuit 3 to the vibrating unit in giving a highest priority to the emergency signal. Consequently, when an accident such as a fire is generated, by the low frequency signal from the acoustic device and the vibration to the purpose by the sound sleep signal, alarming signal, the vibration can be made into a waveform or largeness which a user can sufficiently sense in a body sense. Thus, an escape delay without being made conscious at the time of the accident can be prevented.