A power conversion apparatus includes a plurality of semiconductor modules and a plurality of bus bars. The plurality of bus bars include a positive electrode bus bar connected to a positive electrode power terminal, a negative electrode bus bar connected to a negative electrode power terminal, and a plurality of AC bus bars connected to an AC power terminal. Of a DC bus bar group Including the positive electrode bus bar and the negative electrode bus bar, and an AC bus bar group including the plurality of AC bus bars, part of one of the bus bar groups is sealed with insulating resin, and the other of the bus bar groups is not sealed with insulating resin. A seat is formed on the insulating resin sealing the one of the bus bar groups, and the other of the bus bar groups is mounted on a seat face of the seat.