Power conversion apparatus

The disclosed power conversion device is provided with a smoothing capacitor module having multiple DC terminals arranged alternately on either side in a stacked state; a flow passage forming body which forms refrigerant flow passages through which a refrigerant flows along the capacitor module; and multiple power semiconductor modules provided with DC terminals in a stacked state protruding in one direction from a module case, AC terminals protruding in one direction from the module case, and the module case having a cooling surface. The power semiconductor modules are fixed to the flow passage forming body such that the cooling surface of the module case of the power semiconductor modules is inserted into a refrigerant flow passage of the flow passage forming body and contacts the refrigerant flowing through the flow passage forming body. Each of the stacked state DC terminals of the capacitor module extends from the capacitor module toward the corresponding power semiconductor module. Further, the stacked