Disclosed is a heat exchanger (21) provided with: cooling fin part (24) comprising multiple fins (22), and a base (23) which supports the fins (22) and a plurality of pins (26) pressed in between the fins (22). The heat exchanger (21) comprises multiple fins (22) formed in straight parallel lines, and pins (26) pushed into spaces (25) between the fins (22), from the top of the fins (22) toward the base (23), said pins being wider than the width of the spaces (25). This causes the fins (22) to be plastically deformed so as to have a corrugated appearance, and the pins (26) to be fixed between the fins (22) without coming in contact with the base (23). Multiple pins (26) are arranged along the lengthwise direction of each space (25) with gaps in between, with the pins (26) in adjacent spaces (25) placed in an alternating pattern.