Power conversion apparatus

A power conversion apparatus (10) according to an embodiment includes a cooling jacket (21). The cooling jacket (21) includes a mounting face on which a power module (11c) including a power semiconductor device is mounted, a plurality of radiation fins (21c) that are arranged along a predetermined direction over the substantially whole area of the back side of the mounting face, and a boss (21b) that is placed along the predetermined direction in the central area of the substantially whole area of the back side.