The invention provides a power conversion device which is suitable for connecting power modules accommodating a plurality of switching elements in series. A power conversion device (10) is provided with first and second power modules. Each power module accommodates a plurality of switching elements connected in parallel. Each power module has a first surface and a second surface intersecting the first surface. The plurality of switching elements are aligned in a direction parallel to both the first surface and the second surface inside each power module. The parallel emitter terminals of the plurality of switching elements extend from the second surface at equidistant positions from the switching elements at both ends of the element parallel to each other. The parallel collector terminalsare arranged parallel to the emitter terminals in the parallel direction. The first power module and the second power module are disposed so that a first surface of the first power module faces a first surface of the second power module.