PURPOSE: To provide a hygenic door leaf, simply constructible and easily movable while requiring less space for opening, for a splittype movable room.

CONSTITUTION: A channel 21, with an opening facing downward, for fitting an airtight member therein is provided, extending over the entire width, to the underside of a door leaf 2 that is hung down at its upper end from above so that it can slide rightward and leftward freely against a wall surface panel 11, and a swing-preventing metal 5 is attached to the lower end of the wall surface panel 11 positioned on the opening side of the door leaf 2. The swing- preventing metal 5 is composed of a base plate 51 that is positioned between the underside on the end on the opening-side of the door leaf and the floor surface when the door leaf 2 is closed, an attachment part 52 rising upward from a position on the wall surface panel 11-side of the base plate 51 and fixed with a screw to the wall surface panel 11, and swing-preventing projections 53 that project facing each other from the side on the end of an entrance/exit opening and is in a thickness slightly larger than the thickness of the door leaf 2.