To provide a simple, inexpensive and lightweight solar heat hot water generator which can be installed easily.

The solar heat hot water generator 1 comprises a bag 2 enclosed by a flexible film material are formed, and barrier walls 3 for regulating inflation of the bag provided at several points in the bag 2 wherein the bag 2 is provided with a water injection opening 4 and a water discharge opening 5 at appropriate positions. A framework for supporting the solar heat hot water generator comprises a rail having a hook at the upper end being hooked to the ridge of a housing and a part suspending from a pair of parallel eaves arranged in parallel on the roof, a slider being guided by each rail, and a member for hauling the slider from the rail on the ground toward the upper end of the rail. The framework is hauled onto the roof while fixing the solar heat hot water generator at four corners (of the bag) to the slider and installed on the rails.