To make it possible to position in-plane direction and firmly attach the main body of a cremorne bolt to a hollow portion of a stile by utilizing a steel reinforcing member inserted to the hollow portion of the stile.

A steel reinforcing member 28 inserted to a hollow portion 27 of a stile 2 is fixed with a machine screw 33, and a steel spacer 29 is contacted to this reinforcing member 28. A lock main body 40 of the cremorne bolt 30 is fitted to a notch opening 26 of an eternal vertical board 23 of the stile 2, a bolt 46 penetrated through the notch opening 26 is screwed to a spacer 29 and reinforcing member 28, and lock main body 40 is fixed to the reinforcing member 28 through the spacer 29. By doing this, the lock main body 40 can be firmly attached by utilizing the reinforcing member 28 reinforcing the stile 2, and the lock main body 40 can be positioned in-plane direction by giving predetermined dimensions for the spacer 29 in-plane direction.