A power conversion device including: a reactor formed such that a DC winding and a plurality of coupled windings are wound around one magnetic body, one end of the DC winding is connected to a voltage source, one end of each of the plurality of coupled windings is connected to another end of the DC winding, another end of each of the plurality of coupled windings is connected to each intermediate connection point between a plurality of upper and lower arms composed of switching elements, and a control device for controlling the switching elements, wherein switching of the upper arms or the lower arms is controlled in accordance with a magnitude of a duty of the switching operation and a magnitude relationship between DC current ripple and AC current ripple composing current ripple in the coupled windings.