Abstract: A portable fire alarm system setting device allows easy confirmation of information such as address information set in a storage element which cannot be seen visually from the outside of a terminal device, for example, a fire detector, and also allows the set information to be changed when necessary. The setting device for the fire alarm system comprises bases 33 and 34 for transmitting power and information signals regarding, for example, an address to the fire detector, the bases having removably connected thereto fire detectors 20 and 21 for the fire alarm system; a microcomputer 5 having a confirmation mode and a setting mode for controlling the sending and receiving of, for example, address information signals to and from the fire detector through transmission circuits 10 and 11; an indicator section 8 connected to the microcomputer 5 for indicating the fire detector address; and an operation section 7 used to send out an address as operation information to the fire detector.