WATERPROOF PAN AND MANUFACTURE THEREOF

PROBLEM TO BE SOLVED: To set the parallelism and level of a wall building surface at the time of installation while ensuring the strength of an apron section in a bathroom unit in which a washing place and a tub receiving section are unified. SOLUTION: In the waterproof pan, a washing place section 1, in which a wall building surface section 10 is set up to the periphery, a tub receiving section 2, into which a bathtub 6 is fitted, and an apron section 3 are formed integrally. A stepped reinforcing metal fitting 13 continued to the washing place section 1, the tub receiving section 2 and the apron section 3 is mounted near the wall building sections of the washing place section 1 and the tub receiving section 2 on the rear of the waterproof pan 4 at that time, and the parallelism and level of the wall building surface at the time of installation are set easily while the strength of the apron section 3 can be ensured.