A power converter, comprising: a base plate having thereon a switching device; a positive conductor and a negative conductor respectively including plate-shaped main portions (27A, 28A) being disposed parallel to the base plate, one of the main portions (27A, 28A) of the positive and negative conductors (27, 28) being placed over the other of the main portions (27A, 28A) of the positive and negative conductors (27, 28), the main portions (27A, 28A) of the positive and negative conductors (27, 28) being disposed adjacent to and parallel to each other, the main portions (27A, 28A) of the positive and negative conductors (27, 28) being insulated from each other; and a capacitor having a positive terminal and a negative terminal being electrically connected to the respective main portions (27A, 28A) of the positive and negative conductors (27, 28), wherein each of the positive and negative conductors (27, 28) includes a plate-shaped side portion (27B, 28B) extending from the main portion (27A, 28A) toward the base plate, and a terminal portion (27C, 28C) extending from the side portion (27B, 28B) and being joined to the base plate, and the side portion (27B, 28B) is formed with a cutout (27D, 28D), characterized in that the capacitor is mounted on one of the main portions (27A, 28A) of the positive and negative conductors (27, 28) that does not directly face the base plate, the side portions (27B, 28B) of the positive and negative conductors (27, 28) are disposed parallel to and adjacent to each other so that the cutouts (27D, 28D) of the positive and negative conductors (27, 28) face each other, and in each of the side portions (27B, 28B) of the positive and negative conductors (27, 28), the cutout (27D, 28D) extends from the end of the side portion (27B, 28B) adjacent to the base plate beyond the opposite end of the side portion (27B, 28B) connected to the main portion (27A, 28A) to a part of the main portion (27A, 28A). a base plate having thereon a switching device; a positive conductor and a negative conductor respectively including plate-shaped main portions (27A, 28A) being disposed parallel to the base plate, one of the main portions (27A, 28A) of the positive and negative conductors (27, 28) being placed over the other of the main portions (27A, 28A) of the positive and negative conductors (27, 28), the main portions (27A, 28A) of the positive and negative conductors (27, 28) being disposed adjacent to and parallel to each other, the main portions (27A, 28A) of the positive and negative conductors (27, 28) being insulated from each other; and a capacitor having a positive terminal and a negative terminal being electrically connected to the respective main portions (27A, 28A) of the positive and negative conductors (27, 28), wherein each of the positive and negative conductors (27, 28) includes a plate-shaped side portion (27B, 28B) extending from the main portion (27A, 28A) toward the base plate, and a terminal portion (27C, 28C) extending from the side portion (27B, 28B) and being joined to the base plate, and the side portion (27B, 28B) is formed with a cutout (27D, 28D), characterized in that the capacitor is mounted on one of the main portions (27A, 28A) of the positive and negative conductors (27, 28) that does not directly face the base plate, the side portions (27B, 28B) of the positive and negative conductors (27, 28) are disposed parallel to and adjacent to each other so that the cutouts (27D, 28D) of the positive and negative conductors (27, 28) face each other, and in each of the side portions (27B, 28B) of the positive and negative conductors (27, 28), the cutout (27D, 28D) extends from the end of the side portion (27B, 28B) adjacent to the base plate beyond the opposite end of the side portion (27B, 28B) connected to the main portion (27A, 28A) to a part of the main portion (27A, 28A).