A resonant power conversion device includes: series-connected filter capacitors disposed at an input side and transformers, a power conversion circuit disposed between a primary side of the transformer and the filter capacitor, and a power conversion circuit disposed between a primary side of the transformer and the filter capacitor. The resonant power conversion device further includes: an adjustment amount calculator for calculating an adjustment amount indicating a delay time of a rise of a pulse of a control signal to a switching element or a switching element in accordance with a voltage difference between the filter capacitors; and a controller for, in accordance with the adjustment amount, causing a delay in the rise of the pulse of the control signal to the switching element or the switching element, and outputting the rise-delayed control signal to the switching elements.