In a power conversion device (100, 200, 300, 400, 500, 600, 700), a distance (L1, L301) between an output terminal (21c, 321c, 421c, 521c) of a first switching module (21, 321, 421, 521, 721) and a cathode terminal (31b, 331b, 431b, 531b) of a first diode module (31, 331, 431, 531) in a first direction is adapted to be equal to a distance (L2, L302) between an output terminal (22c, 322c, 422c, 522c) of a second switching module (22, 322, 422, 522, 722) and an anode terminal (32a, 332a, 432a, 532a) of a second diode module (32, 332, 432, 532) in the first direction.