The utility model provides a power conversion device. The drive circuit drives a load. The shell is used for accommodating the driving circuit; a plurality of connection terminals connected to the drive circuit and arranged in a predetermined direction; wherein one end of each power line is connected with the load, and the other end of each power line is connected with the connecting terminals, and the sending-out part is arranged opposite to the connecting terminals and sends out the other ends of the power lines at a sending-out interval different from the arrangement interval of the connecting terminals. The housing is provided with a plurality of guide walls for guiding the other ends of the power lines to the connection terminals, respectively, and the angles of the guide walls are set so as to be along the direction in which the other ends of the power lines enter the connection terminals.