PROBLEM TO BE SOLVED: To provide a sash and a sash installation method which can suppress deterioration of workability in installation.;SOLUTION: A sash 1 includes a frame body 6 formed by combining an intermediate rail (an upper rail 2u, a bottom rail 2d) and a longitudinal stile 4. An intermediate rail narrow width portion 20 provided in the intermediate rail and having a width W1 as viewed from the longitudinal direction smaller than a width W2 of a head jamb groove portion 8R and a width W3 of a sill groove portion 10R is arranged closer to a head jamb 8 and a sill 10 than an intermediate rail wide width portion 30. A longitudinal stile narrow width portion 40 provided in the longitudinal stile 4 and having a width W7 as viewed from the longitudinal direction smaller than the width W2 and the width W3 overlaps a part of the intermediate rail narrow width portion 20 as viewed from the longitudinal direction and protrudes from the intermediate rail narrow width portion 20 as viewed from the longitudinal direction. At least a part of a longitudinal stile wide width portion 50 provided in the longitudinal stile 4 and having a width W8 as viewed from the longitudinal direction larger than the width W7 overlaps the intermediate rail wide width portion 30 when viewed from the longitudinal direction.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT
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