Heat exchanger with side plate having a through hole

A heat exchanger comprising:

• a plurality of tubes layered in a layering direction;
• a reinforcing side plate arranged outside of the tubes in the layering direction, the side plate extending in a longitudinal direction of the plurality of tubes;
• a core plate extending in a layering direction, a longitudinal end of each of the plurality of tubes being connected to the core plate;
• and
• a tank connected to the core plate, wherein
• the side plate has an end portion in a longitudinal direction of the side plate, and the core plate has a wall portion extending in the longitudinal direction of the plurality of tubes, the wall portion being located on an end portion of the core plate in the layering direction,
• the end portion of the side plate has a brazing section brazed to an outer face of the wall portion of the core plate,
• the end portion of the side plate has a through hole located in the brazing section;
• and
• the through hole is located at a position at which the side plate overlaps with the outer face of the wall portion of the core plate that is defined by bending an outer periphery of the core plate to extend in the longitudinal direction.