Heat exchanger

A heat exchanger, comprising:

• a heat exchange core including a stacked plurality of plates, a top plate and a bottom plate,
• the stacked plurality of plates comprises two end portion plates, and a plurality of intermediate plates stacked between the two end portion plates, the two end portion plates including an upper side end portion plate and a lower side end portion plate relative to a stacking direction,
• of the stacked plurality of plates, each set of adjacent said plates demarcates a flow path between plates such that fluid flows therebetween,
• each of the stacked plurality of plates has a flow-through portion penetrating through the respective plates through which a fluid flows, and at least one set of the flow-through portion is provided at one of the flow paths between plates, so as to enable the fluid to flow from one side to an other side,
• each of the stacked plurality of plates further comprises a through hole, and each of the through holes demarcates a portion of a flowthrough path which penetrates through the stacked plurality of plates in the stacking direction and is isolated from the flow path between plates,
• a boss portion comprising a substantially elliptically shaped edge portion is formed at each of the plates of the stacked plurality of plates, the substantially elliptically shaped edge portion structured and arranged to extend along and surround an outer side of both of the flow-through portion and the through hole, as seen in a plan view of the heat exchange core, and
• of the two end portion plates, a circulating flow portion is formed as an internal space of the boss portion, in at least either one of the upper side end portion plate and the lower side end portion plate.