An electric power conversion device that converts power between a power supply (1) and a load (9), and comprises: a pressure-boosting device (2) having a rectification unit (23) for pressure boosting, that prevents backflow of current from the load (9) side to the power supply (1) side, said pressure-boosting device (2) changing the voltage of power from the power supply (1) to a prescribed voltage; a commutation device (4) that performs a commutation operation whereby current that flows through the pressure-boosting device (2) is caused to flow to a different path; and a control device (100) that performs control of the variable voltage of the pressure-boosting device (4) and control of the commutation action of the commutation device (4). The commutation device (4) is configured such that, when the commutation device (4) is performing commutation, a current required for generating voltage to perform reverse recovery of the rectification unit (23) for pressure boosting flows to the commutation device (4).