HEAT EXCHANGER

A heat exchanger includes a first stack portion and a second stack portion. The first stack portion has a plurality of plates which are stacked, and a first refrigerant passage and a first coolant passage are formed between the plurality of plates. The second stack portion has a plurality of receiver components which are stacked, and a refrigerant retaining portion leading to the first refrigerant passage is formed in the plurality of receiver components. The second stack portion is stacked on the first stack portion in the same direction as a stacking direction in which the plurality of plates are stacked.