PROBLEM TO BE SOLVED: To provide a solar heat hot water device capable of effectively utilizing solar heat more than before by reducing waste so that, though heat can be collected by using a solar heat collector, heat collecting operation is quit as a hot water storage tank reaches its maximum heat storage amount.SOLUTION: Control means 20, 30 of a solar heat hot water device A determine whether a prescribed condition under which it is considered that hot water heating using a solar heat collector 1 can continue to be executed is met when the hot water temperature or a heat storage amount in a hot water storage tank 21 reaches or exceeds a prescribed value, and perform control to shift at least a part of the heat in the hot water storage tank 21 to the side of a bathtub 5 by heating or reheating the bathtub 5 when it is determined that the prescribed condition is met.
