To provide a cordless heating device using batteries, having a reduced weight and improved safety by increasing the life of the batteries by cooling them and reducing the number of the batteries.

The heating device comprises a burner part 19 having a heater 18 for heating a carbureter 17, blowing means 25, the batteries 26, a battery cooling air passage 37 for guiding air from the blowing mean 25 to the batteries, and a DC power supply 27. During the energization of the heater 18, the burning of the burner 19 or the charge of the batteries 26 with the DC power supply 27, the temperature of the batteries 26 rises, but the air cools the batteries 26 with the drive of the blowing means 25 and is exhausted via a vent hole 32 communicating a battery chamber 31 with an exterior of a body to the exterior of the body, thus preventing the deterioration of the batteries. Even when the batteries are put into abnormal conditions to cause the generation of flammable gas, an interior of the body is ventilated to secure safe operation.