A window shade comprises a lower rail, two upright posts, an upper rail, and a plurality of rail members. The upright posts are connected uprightly with two sides of the lower rail. The upper rail is connected with free ends of the upright posts. Each of the rail members has a main body, a through hole, and a rod. The through hole penetrates two side ends of the main body. The rod is disposed in the through hole such that two ends of the rod are jutted out of the through hole to be connected between the two upright posts. The rail members are parallel to one another and are connected between the two upright posts.