To prevent the passage of drafts and moisture by blocking a gap between a floor surface and fittings in the closed state of the fittings to be opened/closed.

When a fittings door or a sliding door for access to two rooms through a plane floor having no level difference is in a closed state, a sealing mechanism 4 in a perspective view is pushed down from the fittings to block the gap between the plane floor and the fittings. When the fittings are in an opened state, the sealing mechanism 4 is pulled up into the fittings and stored therein to smooth the movement of the fittings.