To properly acquire a cooling water temperature of a fuel cell system, and a cooling water temperature of an air-conditioning system using a small number of temperature gages in a cooperation cooling system of a fuel cell and an air-conditioner.

This cooperation cooling system 80 of a fuel cell and an air-conditioner has a AC cooling water temperature gage 142 in a AC circulation flow path. A cooperation cooling control part 150 has functions for correcting the AC cooling water temperature detected by the AC cooling water temperature gage 142 based on heat exchanging volumes of a heat core 120, a AC heat exchanger 124, and a piping of the AC circulating flow path, when a three-way valve 96 is under a connected condition, estimating the cooling water temperature of each element of the AC circulating flow path, and estimating the temperature θXof the cooling water on the AC side flowing in the FC circulating flow path. Without providing the cooling water temperature gage in the AC circulating flow path, the cooling water in each element can be estimated based on detection with the FC cooling water temperature gage provided in the FC circulating flow path.

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