Cooling device and method of manufacturing cooling device

A cooling device, comprising:

• a case equipped with a supply port and a discharge port, the supply port supplying a coolant to an interior of the case, and the discharge port discharging the coolant from the interior of the case to an exterior of the case;
• and
• a stacked core disposed in the case, the stacked core comprising a plurality of punched plates, each with a same shape, and each punched plate including:
• a plurality of linear portions that extend in triangle waveforms in a flow direction of the coolant and that are spaced apart in an amplitude direction of the waveforms, and
• linking portions that are spaced apart in an extension direction of the linear portions and that link the linear portions to one another in the amplitude direction,
• the punched plates being alternately disposed front-to-back and the linear portions being superposed over one another, and the linking portions of the superposed punched plates being disposed spaced apart in the extension direction,
• wherein the plurality of linear portions include amplitude peak portions alternately arranged with straight general portions that extend diagonally with respect to the amplitude direction, and
• wherein each of the linking portions links an amplitude peak portion of one of the linear portions with a respective straight general portion of another of the linear portions that is adjacent to the one of the linear portions in the amplitude direction.