To fetch a plurality of output voltages while suppressing a mounting space or cost from increasing to the minimum.

In an insulation power supply 31, the primary winding 1A of an insulation transformer 1 and an auxiliary winding 51 are electrically insulated. Therefore, another power supply receiving the voltage supply from application terminals 32, 33 does not need troublesome insulation of input side and output side, so that it includes no insulation transformer. Thus, miniaturization can be attained by suppressing a cost increase.