Abstract: A heat exchanger that performs heat exchange between a supply air flow and an exhaust air flow includes: a heat exchange element in a prism shape; a plurality of frame bars, each of the plurality of frame bars being attached to a corresponding side of the heat exchange element, the corresponding side extending along an axial direction of the heat exchange element; and an end face plate at least partially covering an axial end face of the heat exchange element, the plurality of frame bars being joined to the end face plate. The frame bars are joined to the end face plate in such a way as to be movable in the axial direction of the heat exchange element.

Abstract: A heat exchange element includes a stack of a plurality of flow passage plates each including a plurality of passage portions serving as flow passages, the passage portions being bonded to each other by an adhesive tape; and a gap adjustment unit having a thickness equal to or larger than a thickness of an adhesive tape and is configured to fill a gap between the flow passage plates.