PURPOSE: To arrange a sliding door in a unit bath unable to secure a sufficient width by providing a recess having such a width that the sliding door can be reciprocated along the wall face on the side wall section of a bathtub connected to the wall face having the entrance to the inside of the unit bath.

CONSTITUTION: An entrance 21 to the inside of a unit bath 10 is formed with a lower panel 13, a wall panel 15, a slender wall panel 17, a ceiling panel 18, and a floor panel 19. The wall panels 15, 16, 17 are covered with a metal plate P to form the wall face. A recess 22 capable of storing two door sashes 24, 24 is formed on the wall face section W of a bathtub 12 connected to the metal plate P covering the lower panel 13, and an interval corresponding to the thickness of three door sashes 24 is provided between the wall face 22a and the lower panel 13. Grooves for sliding two door sashes 24 are provided at the bottom section of a large frame section 23a. Two door sashes 24 can be stored in the overlapped state at the protruded portion to the recess 22 side of the large frame section 23a.