To provide a gas alarm with fire detecting function capable of periodically outputting a message not making a user tired of it by voice and making a satisfactory cost performance good.

It is optionally set to announce a periodic inspection message regularly repeated by voice or perform a room temperature announcement that 'the present interior temperature is 17°C' based on the output of a temperature sensor S2 when a set time comes. Namely, when the switch SW4 is OFF at the set time, the set of the announcement of the periodic inspection message is judged to announce the periodic inspection message when the switch SW4 is OFF, and a temperature detection signal is read from a temperature detection circuit D2 when the switch SW4 is ON (step S43), and the detected temperature is announced (step S45).