A rescuer locator using a bidirectional signal transmitter wherein each rescuer who is dispatched to a disaster spot so as instantly recognize a dangerous state of other rescuers who had been dispatched for rescue or fire suppression, carries a signal transmitter which may be taken by another rescuer when in emergency and may be configured to ask help in such a way to transmit an emergency signal to a base unit installed at a control vehicle, and the signal transmitter equips with a motion detection sensor so as to automatically transmit signals to the base unit depending on the movements of a rescuer who is dispatched to a disaster spot, thus checking in real time a dangerous state of each rescuer.