In order to provide a power conversion device such that it is possible to realize both a suppression of switching surge and a countermeasure to noise in a power conversion device having a semiconductor switching element, a power conversion device including a voltage conversion portion that switches direct current voltage supplied by a positive line and negative line of a direct current power supply with a semiconductor switching element, and outputs converted voltage, is such that a plurality of interline capacitors are connected in parallel between the positive line and negative line, the capacitance of the plurality of interline capacitors is of a value that becomes smaller the nearer to the power conversion portion the position in which the interline capacitor is connected, and the interline capacitor with the smallest value of capacitance is set to a value greater than that of the capacitance between main electrodes when a direct current voltage is applied to the switching element used in the power conversion portion.