A power conversion device, comprising: an isolation transformer including a first winding and a second winding; switching elements (101 to 104) to be connected to the first winding of the isolation transformer; a first conductor configured to connect one end of the first winding of the isolation transformer to an electrode of the switching elements (101, 102); and a second conductor configured to connect another end of the first winding of the isolation transformer to another electrode of the switching elements (101, 102), the first conductor and the second conductor being arranged so as to be parallel to each other along a longitudinal direction of each of the first conductor and the second conductor so that the first conductor and the second conductor are prevented from overlapping each other in the longitudinal direction and a transverse direction of each of the first conductor and the second conductor, characterized in that: a capacitance between the first conductor and the second conductor satisfies the following relationship: Cp 1 > 1 / 2 π × 0.53 × 10 6 2 × Lr 1 − Ctr 1, or wherein a capacitance between the first conductor and the second conductor satisfies the following relationship: 1 / 2 π × 1.8 × 10 6 2 × Lr 1 − Ctr 1 > Cp 1 > 1 / 2 π × 76 × 10 6 2 × Lr 1 − Ctr 1, or wherein a capacitance between the first conductor and the second conductor satisfies the following relationship: 1 / 2 π × 108 × 10 6 2 × Lr 1 − Ctr 1 > Cp 1, where Cp1 represents the capacitance between the first conductor and the second conductor, Lr1 represents a leakage inductance to be generated on the first winding side of the isolation transformer, and Ctr1 represents a line capacitance of the first winding of the isolation transformer, in order to suppress radio interference in the AM radio band and the FM radio band. an isolation transformer including a first winding and a second winding; switching elements (101 to 104) to be connected to the first winding of the isolation transformer; a first conductor configured to connect one end of the first winding of the isolation transformer to an electrode of the switching elements (101, 102); and a second conductor configured to connect another end of the first winding of the isolation transformer to another electrode of the switching elements (101, 102), the first conductor and the second conductor being arranged so as to be parallel to each other along a longitudinal direction of each of the first conductor and the second conductor so that the first conductor and the second conductor are prevented from overlapping each other in the longitudinal direction and a transverse direction of each of the first conductor and the second conductor, characterized in that: a capacitance between the first conductor and the second conductor satisfies the following relationship: Cp 1 > 1 / 2 π × 0.53 × 10 6 2 × Lr 1 − Ctr 1, or wherein a capacitance between the first conductor and the second conductor satisfies the following relationship: 1 / 2 π × 1.8 × 10 6 2 × Lr 1 − Ctr 1 > Cp 1 > 1 / 2 π × 76 × 10 6 2 × Lr 1 − Ctr 1, or wherein a capacitance between the first conductor and the second conductor satisfies the following relationship: 1 / 2 π × 108 × 10 6 2 × Lr 1 − Ctr 1 > Cp 1, where Cp1 represents the capacitance between the first conductor and the second conductor, Lr1 represents a leakage inductance to be generated on the first winding side of the isolation transformer, and Ctr1 represents a line capacitance of the first winding of the isolation transformer, in order to suppress radio interference in the AM radio band and the FM radio band.