To provide an energy-saving heat exchanger for a bathing shower capable of not only reducing sales price but also improving overall energy-saving effect, elongating service life span, having simple structure and properly used to achieve environmental protection in carbon reduction performance.

This heat exchanger for the bathing shower is disposed in a bathtub 2, a pipe P for tap water is connected to a pipe joint J in a water inlet 21 of a lower metallic plate 20, an intake pipe 101 of a water heater 100 is connected to a pipe joint J of a water outlet 22 of the lower metallic plate 20, and the released hot shower water W falls on a top face 11 of an upper metallic plate 10 through a plurality of holes h of a foot board 3 to heat the cold tap water W flowing to a hollow space 15 surrounded by the metallic plates 10, 20.