SASH

PROBLEM TO BE SOLVED: To provide a sash capable of facilitating the connection of a metal fitting attached to outer periphery of a sash frame with a building frame and simplifying mounting of an auxiliary member for attaching a frame member and the frame member. SOLUTION: A first auxiliary member 1, a second auxiliary member 2, and a frame member 3 are provided, the first auxiliary member 1 is provided with a first engaging part 11 of the frame member 3 and is attached to a sash frame F, and the second auxiliary member 2 is provided with a second engaging part 22 of the frame member 3 and is attached to the first auxiliary member 1 by elastic engagement. The second engaging part is positioned on the building frame side more than the first auxiliary member 1, the frame member 3 is attached to the first engaging part 11 and the second engaging part by elastic engagement, and a connection part E of the sash frame F on which the first auxiliary member 1 is attached and a building frame W are exposed through a clearance between the first auxiliary member 1 and the building frame W in a condition before the second auxiliary member 2 is attached. Moreover, the second auxiliary member 2 may be provided with the first engaging part 11 and the second engaging part 22 and the frame member 3 may be attached to the engaging parts by elastic engagement.