To improve heat conduction efficiency in an aluminum ice pan of a conventional automatic ice making machine.

When looking at from the side by changing a viewpoint not from a conventional viewpoint, use of an aluminum extruded section enables to integrally make a rib in one direction of an ice making unit parallel to a refrigerant passage, a baseplate and the refrigerant passage, and this integral shape is realized, and an ice making unit can be formed for remarkably improving heat conduction efficiency together with integration of the refrigerant passage and an ice making chamber. This example recommends brazing for joining a partition plate of a grating and a U-shaped pipe. This brazing does not substantially become a hindering factor, due to being not in a position for intercepting a heat conduction passage. In an aluminum heat exchanger, brazing joining is optimal in terms of productivity and stability of quality.