Heat exchanger

In a heat exchanger, a refrigerant flow path and a fluid flow path are formed by a plurality of laminated plate members (62). The plate member has formed therein: an inflow section (626) which is provided at one end of the refrigerant flow path and through which the refrigerant flows into the refrigerant flow path; an outflow section (632) that is provided at the other end of the refrigerant flow path and that causes the refrigerant flowing through the refrigerant flow path to flow out; a recessed portion (633) disposed adjacent to either the inflow portion or the outflow portion; a communication path (636) that communicates either the inflow part or the outflow part with the recess; and a partition wall (641) that partitions the refrigerant flow path and the communication path. 在热交换器中，通过层叠配置的多个板部件(62)形成制冷剂流路和流体流路。在板部件形成有：流入部(626)，该流入部设置于制冷剂流路的一端部，使制冷剂流入制冷剂流路；流出部(632)，该流出部设置于制冷剂流路的另一端部，使在制冷剂流路中流动的制冷剂流出；凹部(633)，该凹部被配置为与流入部和流出部中的任一方相邻；连通路(636)，该连通路使流入部和流出部中的任一方与凹部连通；以及分隔壁(641)，该分隔壁将制冷剂流路和连通路分隔。