Abstract: A gas combustion type hair drier 1 includes a gas tank 29, for storing combustion gas, a combustor 11 for combusting combustion gas supplied from the gas tank 29, a blower 17 exchanging heat resulting from the combustor 11, a dry battery 31 serving as a power supply to rotate a motor 19 of the blower 17, an igniter device for igniting the combustion gas, an ejector 7 for allowing outside air to be drawn due to negative pressure created by a flow speed of the combustion gas to be supplied to the combustor 11, and a casing 3 that receives the combustor 11, the blower 17 and the ejector 7, with the combustor 11 having a plurality of combustion chambers 85 comprised of non-circular outer peripheral walls around a periphery of a gas combustor section 73.