A power converting apparatus includes a power input part to which power is input; a power converting part converting the power input through the power input part; a converting current detecting part detecting a converting current of the power converted in the power converting part; a converting voltage detecting part detecting a converting voltage of the power converted in the power converting part; and a controlling part controlling the power converting part so that a value of power calculated by multiplication of the converting current detected in the converting current detecting part by the converting voltage detected in the converting voltage detecting part falls within a predetermined range of a preset reference value.