In order to simply switch a switching frequency, a power conversion device (13) is disposed between an AC power source (1) and a load (12) and includes: a rectifier circuit unit (2) that rectifies a voltage of the AC power source (1); a smoothing unit (25) that smooths a DC voltage on the load (12) side of the rectifier circuit unit (2); a short-circuiting unit (24) that is disposed on the AC power source (1) side of the smoothing unit (25) and that short-circuits the AC power source (1); a step-up reactor (4) that is disposed on the AC power source (1) side of the short-circuiting unit (24); at least one of a reactor current detecting unit (8) that detects the current of the step-up reactor (4) and a bus voltage detecting unit (9) that detects an output voltage of the smoothing unit (25); a counterflow preventing element (6) that prevents a counterflow of the current from the smoothing unit (25) to the AC power source (1); a switching control unit (10) that generates a drive pulse from the output signal of the reactor current detecting unit (8) or the bus voltage detecting unit (9) and that outputs a control signal for the short-circuiting unit (24); and a switching frequency changing unit (11) that is disposed between the switching control unit (10) and the short-circuiting unit (24) and that changes a frequency of the control signal using a logic operation.
