Heat exchanger and refrigeration cycle device

Abstract

A heat exchanger according to an embodiment has: a main heat exchange unit having a plurality of main refrigerant flow paths through which a refrigerant flow; and an auxiliary heat exchange unit through which the refrigerant flows between the main heat exchange unit and the auxiliary heat exchange unit. The auxiliary heat exchange unit has a plurality of heat transfer tubes having auxiliary refrigerant flow paths through which the refrigerant flows, and a header connected to the heat transfer tubes. The header has: a first plate material to which a refrigerant flow pipe for guiding the refrigerant is connected; one or a plurality of intermediate plate materials in which a space flow path into which the refrigerant is introduced is formed; and a second plate material to which the heat transfer tubes are connected. The space flow path has a merging part that merges the plurality of auxiliary refrigerant flow paths.