Heating type oximeter

A heating type oximeter (1) comprises: a heat insulating part (40) that is formed in a sheet-like shape and has heat insulating properties; a heat generating part (30) that is formed in a sheet-like shape and comprises a resistor generating heat when electricity is turned on; a first temperature detecting part (21) that is formed in a sheet-like shape and comprises a first temperature sensor (211) detecting the temperature of the heat generating part (30); an oxygen saturation level acquiring part (12) for optically acquiring a blood oxygen saturation level that is formed in a thin plate shape and comprises light emitting elements (103, 104) and a light receiving element (107); and a third temperature detecting part (23) that is formed in a sheet-like shape and comprises a third temperature sensor (231) detecting the temperature of a living body, said heating type oximeter (1) being configured by laminating the third temperature detecting part (23), the oxygen saturation level acquiring part (12), the first temperature detecting part (21), the heat generating part (30) and the heat insulating part (40) in this order.