3 are respectively connected to a hot water supply way a 2 of the neck receiving part and a hot water drain way a 3 of the neck receiving part which are branched from the hot water supply pipe a the hot water supply way a 2 of the neck receiving part and the hot water drain way a 3 of the neck receiving part respectively have electromagnetic valves 30 a and 30 b midway thereof the electromagnetic valve 30 a supplies hot water to the hollow part 3 b of the neck receiving member 3 by opening closing operations the electromagnetic valve 30 b drains hot water form the hollow part 3 b of the neck receiving member 3 by opening closing operations reference numeral 31 designates a hydraulic pressure sensor for measuring hydraulic pressure of the hollow part 3 b of the neck receiving member 3 numeral 32 designates electromagnetic valves control part for controlling opening closing operations of the electromagnetic valves 30 a and 30 b hereinafter the operation will be explained of the hair washer according to the second embodiment with reference to fig4 and 5 first when the hair washer is started hot water and water are supplied to the mixing tank 11 from an external water supply and an external hot water supply via the curb stop.