The power conversion apparatus includes electronic components constituting a power conversion circuit, a cooler for cooling at least some of the electronic components, and a case housing the at least some of the electronic components and the cooler. The at least some of the electronic components and the cooler are fixed to and integrated in a frame as an internal unit. The frame has such a shape that at least some of the electronic components constituting the internal unit are disposed inside the frame. The frame includes a terminal block on which input/output terminals for inputting and outputting controlled power are mounted for providing connection between the input/output terminals and external devices.