To provide a bathroom structure exerting a stable heat retaining effect on the bathroom whole body including a wash place as well as a bathtub.

A lower-part heat insulating material layer 21 is disposed below a unit bath 10 including the bathtub 14 and the wash place 15 at a prescribed interval, and a heat retaining air layer 18 thermally continued below from the bathtub 14 to the wash place 15 and having its circumference surrounded with an outer circumference heat insulating material layer 22 is formed between the unit bath 10 and the lower-part heat insulating material layer 21, so that the heat retaining air layer 18 is functioned as a perfect heat retaining layer surrounded with the outer circumference heat insulating material layer 22 and the lower-part heat insulating material layer 21, and the bathtub 14 and the wash place 15 are effectively retained warm by the presence of the heat retaining air layer 18 and the lower-part heat insulating material layer 21. The heat transmitted from the bathtub 14 to the heat retaining air layer 18 is transmitted below the wash place 15 and retains the heat of the wash place 15 from a floor face to provide the stable heat retaining effect of the bathroom whole body including the wash plate 15 as well as the bathtub 14.