To avoid freezing water in a heat exchanger even when the heat exchanger is used as a supercooled water generating heat exchanger by improving the distribution mode of the fluid flowing inside a plate-type heat exchanger.

A plate-type heat exchanger is applied as a supercooled water generating heat exchanger to be used as an ice thermal storage device to generate ice by the supercooling canceling operation of the supercooled water. A plurality of corrugated heat transfer plates 54, 55, 56, 57 are stacked, and contact parts are brazed to form a refrigerant flow passages A, A and a water flow passage B between the plates. The quantity of the brazing filler metal C of a part facing the water flow passage B is larger than that on a part facing the refrigerant flow passages A, A. A corner part of the water flow passage B is closed by the brazing filler metal C projected from the brazed part facing the water flow passage B to prevent water from flowing in the corner part.