To provide a heat dissipater capable of effectively cooling a refrigerant, and a freezing cycle equipped with the former.

A heat dissipater in a freezing cycle is adapted such that it is a heat dissipater 100 used in a compression freezing cycle 1 to cool a refrigerant and it includes a tank 400 including an inlet section 410 and an outlet section 420 for a refrigerant, and a plurality of tubes 200 coupled to the tank for cooling the refrigerant with heat transmitted to the tubes. In the heat dissipater, a compressor 2 in the freezing cycle is one to discharge lubricating oil together with the refrigerant, and internal pressure in the heat dissipater exceeds a critical point of a refrigerant, and further for the inside of the foregoing tank communicated with an outlet section when the height of a lower end of a flow passage opening section at the outlet is assumed H1 and the height of the lower end of the flow passage opening in the tube is assumed H2, these satisfy the relationship: H1≤H2.