The present invention relates to an overpower detection device 51 capable of detecting, with a simple configuration, overpower of a circuit that processes a signal associated with instantaneous variation. The overpower detection device 51 of the present invention includes: a power information acquisition section 61 for acquiring an index value of power, at each timing, of a signal transmitted or received in a target device; a comparison section 62 for comparing the index value acquired by the power information acquisition section 61 with an evaluation threshold; a comparison result accumulation section 63 for accumulating a value indicating a comparison result of the comparison section 62 at the each timing; and an overpower determination section 64 for determining overpower of a circuit in the target device, based on an accumulation result of the comparison result accumulation section 63.