Heat exchange plate and method for manufacturing heat exchange plate

A heat exchange plate having a plurality of flow paths through which a heat medium flows and having an elongated rectangular plate shape, the heat exchange plate comprising:

• an upper wall and a lower wall that cover the plurality of flow paths from both sides of the heat exchange plate in a plate thickness direction;
• and
• a plurality of partition walls that connect the upper wall and the lower wall in the plate thickness direction and that partition the plurality of flow paths, wherein
• a direction in which the heat medium flows through the plurality of flow paths is a longitudinal direction of the heat exchange plate,
• at least one end portion of the heat exchange plate in the longitudinal direction is a closing portion that closes the plurality of flow paths,
• the upper wall, the lower wall, and the plurality of partition walls that constitute the closing portion are compressed in the plate thickness direction, and
• the heat exchange plate further comprises:
• a brazing portion that fills a gap present between the upper wall, the lower wall, and the plurality of partition walls that constitute the closing portion.