To prevent freezing of a supercooled liquid, and to enable execution of a stable cooling operation.

A plurality of heat transfer plates P1 are stacked, and a refrigerant flow passage and a heating medium flow passage are formed alternately between the heat transfer plates P1, while an inflow path 25 and an outflow path 26 of a heating medium and an inflow path 27 and an outflow path 28 of a refrigerant, which pierce the heat transfer plate P1 respectively, are provided. In a plate-type heat exchanger thus constituted, a constitution is made around the outflow path 26 of the heating medium, so that a revolving flow is generated in the heating medium in the flow passage 23 of the heating medium.