To provide a sash having a lower frame capable of draining water generated at the indoor side of a rail by preventing dust from accumulating in the rail.

A sash includes: a lower frame body; and a lower frame auxiliary material attached to the top face of the lower frame body. The lower frame auxiliary material includes: an upper surface section, a rail, a hollow section, a wall surface section and a drainage hole. The upper surface section is formed with an almost flat top face, and the rail in which the door roller of a sash travels is formed so as to be protruded upward from the upper surface section, and the hollow section is formed at the lower side of the upper surface section, and the wall surface section is formed at the lower side of the rail, constituting a part of the hollow section, and the drainage hole is formed at the indoor side of the rail of the upper surface section, and water entering from the drainage hole is ejected via the hollow section to the outdoor side.