A power conversion device (100,200) comprising, on a base: a transformer; a first rectifier element; a second rectifier element; a smoothing coil; and a smoothing capacitor, the transformer including a secondary winding including a first secondary winding and a second secondary winding, and an intermediate terminal at which to connect the secondary winding and the base, the smoothing coil including a smoothing coil first terminal and a smoothing coil second terminal, the first rectifier element being connected to a first terminal formed at one end side of the first secondary winding, and to the smoothing coil first terminal, the second rectifier element being connected to a second terminal formed at one end side of the second secondary winding, and to the smoothing coil first terminal, the smoothing capacitor being connected to the smoothing coil second terminal, and to the intermediate terminal, another end side of the first secondary winding and another end side of the second secondary winding being connected to each other at a connection portion, the connection portion being located between the first terminal and the second terminal, the first terminal or the second terminal being located between the intermediate terminal and the connection portion, and wherein at least one of the first secondary winding or the second secondary winding is formed integrally with the intermediate terminal, which is formed so as to extend from the first secondary winding or the second secondary winding, is provided opposite to the connection portion across the second terminal or the first terminal, is connected to a boss, formed on the base, together with one terminal of the smoothing capacitor, and it is grounded. a transformer; a first rectifier element; a second rectifier element; a smoothing coil; and a smoothing capacitor, the transformer including a secondary winding including a first secondary winding and a second secondary winding, and an intermediate terminal at which to connect the secondary winding and the base, the smoothing coil including a smoothing coil first terminal and a smoothing coil second terminal, the first rectifier element being connected to a first terminal formed at one end side of the first secondary winding, and to the smoothing coil first terminal, the second rectifier element being connected to a second terminal formed at one end side of the second secondary winding, and to the smoothing coil first terminal, the smoothing capacitor being connected to the smoothing coil second terminal, and to the intermediate terminal, another end side of the first secondary winding and another end side of the second secondary winding being connected to each other at a connection portion, the connection portion being located between the first terminal and the second terminal, the first terminal or the second terminal being located between the intermediate terminal and the connection portion, and wherein at least one of the first secondary winding or the second secondary winding is formed integrally with the intermediate terminal, which is formed so as to extend from the first secondary winding or the second secondary winding, is provided opposite to the connection portion across the second terminal or the first terminal, is connected to a boss, formed on the base, together with one terminal of the smoothing capacitor, and it is grounded. another end side of the first secondary winding and another end side of the second secondary winding being connected to each other at a connection portion, the connection portion being located between the first terminal and the second terminal, the first terminal or the second terminal being located between the intermediate terminal and the connection portion, and wherein at least one of the first secondary winding or the second secondary winding is formed integrally with the intermediate terminal, which is formed so as to extend from the first secondary winding or the second secondary winding, is provided opposite to the connection portion across the second terminal or the first terminal, is connected to a boss, formed on the base, together with one terminal of the smoothing capacitor, and it is grounded.