| 摘要 |
PROBLEM TO BE SOLVED: To provide a plane section in which a ventillating fan is attached and suppress drop of condensed water by shortening a boundary section with the plane section as much as possible. SOLUTION: A first recessed section 7 and a second recessed section 8 which protrude upward in a bath room and of which lower face has a concave shape are provided in parallel in a first direction 9 on a ceiling face of the bath room, and the first recessed section 7 is provided in a second direction 10 which is orthogonal to the first direction 9 on the ceiling face of the bath room. The second recessed section 8 is continuous with the first recessed section 7 through a step section 6, a plane section 3 is provided in at least either of corners on the ceiling face of the bath room which are positioned on both sides of the second recessed section 8 in the second direction 10, and a ventillating fan is attached on the plane section 3. |
