A power conversion device adapted to perform conversion between DC power and AC power, comprising: a power module comprising an inverter circuit that comprises, for each phase, an upper arm switching element and a lower arm switching element; and a drive circuit board upon which are implemented, for each phase, an upper arm driver circuit (7UP - 7WP) that outputs a drive signal to the upper arm switching element and a lower arm driver circuit (7UN - 7WN) that outputs a drive signal to the lower arm switching element; characterized in that, the drive circuit board is made as a laminated board in which a plurality of conductor layers and a plurality of insulating layers are alternately laminated together, and comprises a first board edge portion to which control terminals for the upper arm switching elements are connected, a second board edge portion to which control terminals for the lower arm switching elements are connected, and a board region located between the first and second board edge portions; the first board edge portion is arranged opposite to the second board edge portion; in the board region, along with an upper arm implementation region upon which the upper arm driver circuits (7VP - 7WP) are implemented and a lower aim implementation region upon which the lower arm driver circuits (7UN - 7WN) are implemented being formed for each phase, a low voltage system region is formed upon which are implemented signal transmission elements that transmit control signals to each of the driver circuits while electrically insulating the control signals; and signal wiring (40U, 40V, 40W) that transmits control signals from the signal transmission elements to the corresponding driver circuits is formed so as to pass under the lower arm driver circuits (7UN - 7WN) in a lower conductor layer than the conductor layer at which the lower arm driver circuits (7VN - 7WN) are implemented. a power module comprising an inverter circuit that comprises, for each phase, an upper arm switching element and a lower arm switching element; and a drive circuit board upon which are implemented, for each phase, an upper arm driver circuit (7UP - 7WP) that outputs a drive signal to the upper arm switching element and a lower arm driver circuit (7UN - 7WN) that outputs a drive signal to the lower arm switching element; characterized in that, the drive circuit board is made as a laminated board in which a plurality of conductor layers and a plurality of insulating layers are alternately laminated together, and comprises a first board edge portion to which control terminals for the upper arm switching elements are connected, a second board edge portion to which control terminals for the lower arm switching elements are connected, and a board region located between the first and second board edge portions; the first board edge portion is arranged opposite to the second board edge portion; in the board region, along with an upper arm implementation region upon which the upper arm driver circuits (7VP - 7WP) are implemented and a lower aim implementation region upon which the lower arm driver circuits (7UN - 7WN) are implemented being formed for each phase, a low voltage system region is formed upon which are implemented signal transmission elements that transmit control signals to each of the driver circuits while electrically insulating the control signals; and signal wiring (40U, 40V, 40W) that transmits control signals from the signal transmission elements to the corresponding driver circuits is formed so as to pass under the lower arm driver circuits (7UN - 7WN) in a lower conductor layer than the conductor layer at which the lower arm driver circuits (7VN - 7WN) are implemented. a drive circuit board upon which are implemented, for each phase, an upper arm driver circuit (7UP - 7WP) that outputs a drive signal to the upper arm switching element and a lower arm driver circuit (7UN - 7WN) that outputs a drive signal to the lower arm switching element; characterized in that, the drive circuit board is made as a laminated board in which a plurality of conductor layers and a plurality of insulating layers are alternately laminated together, and comprises a first board edge portion to which control terminals for the upper arm switching elements are connected, a second board edge portion to which control terminals for the lower arm switching elements are connected, and a board region located between the first and second board edge portions; the first board edge portion is arranged opposite to the second board edge portion; in the board region, along with an upper arm implementation region upon which the upper arm driver circuits (7VP - 7WP) are implemented and a lower aim implementation region upon which the lower arm driver circuits (7UN - 7WN) are implemented being formed for each phase, a low voltage system region is formed upon which are implemented signal transmission elements that transmit control signals to each of the driver circuits while electrically insulating the control signals; and signal wiring (40U, 40V, 40W) that transmits control signals from the signal transmission elements to the corresponding driver circuits is formed so as to pass under the lower arm driver circuits (7UN - 7WN) in a lower conductor layer than the conductor layer at which the lower arm driver circuits (7VN - 7WN) are implemented.