PURPOSE: To save the handling time of the sensor for setting an address and also to avoid an address setting error.

CONSTITUTION: An automatic fire alarm device has the address from a fire receiver 1 with a sensing lines L1,...Ln+1, successively accesses the sensors A1,...An and decides an alarming place. In the device, the sensors are connected with the fire receiver 1 with the sensing lines by being transferred in order, an address giving signal output means 11 is provided in the fire receiver and the sensors are provided with address giving signal recognizing means Aa1,...Aan, address storing means Ab1,...Abn, holding the giving address and feed connecting means As1,...Asn feeding the sensing lines so as to execute connection with the sensing lines.