To clean and exchange by removing a ditch typed material by providing a ditch typed material and a threshold between a bathroom and a room outside of the bathroom, and by forming separately the ditch typed material from a floor of the bathroom to connect to the bathroom or the room outside of the bathroom.

A ditch typed material 3 made of aluminum is provided between a floor 1 of a bathroom and a floor 2 of a dressing room. Lug pieces 31, 32 are attached overlapping on an upper surface of a cutout part of an end part of the floor 1 of the bathroom and an upper surface of a wood floor of the dressing room by extending the lug pieces 31, 32 to a top end of a side wall of the ditch typed material 3. A threshold 4 is provided in the ditch typed material 3, an upper surface of the threshold 4 is arranged flush with an upper surface of the floor 2 of the dressing room, and a step is prevented from existing. A drain 34 is provided on a bottom of the ditch typed material 3 to connect drain pipe 35, and drain is enabled. A lower end part 52 of a hanging door 5 is inserted in a space between section bars 41, 41 of the threshold 4. By constituting it like this, it is possible to clean and exchange by removing a ditch typed material 3.