Abstract: A power conversion device according to the present invention includes a power conversion circuit having a switching element and converting DC power to AC power, a capacitor-integrated busbar, and a housing accommodating the power conversion circuit and the capacitor-integrated busbar. The capacitor-integrated busbar includes a highly dielectric plate-like resin having a resin material as a base material, and a pair of metal conductors having a facing region where the metal conductors face each other, the facing region being joined to opposing surfaces of the plate-like resin. The plate-like resin and the pair of metal conductors of the capacitor-integrated busbar form a capacitor. The power conversion circuit is supplied with power via the metal conductors.