To provide a decoration for windows, being also usable as a curtain rail.

This decoration includes a base portion 1 to be attached to a vertical inner peripheral side face of a window opening, and a decoration portion 2 extending from the base portion 1 along the window face direction. The decoration portion 2 includes a part which allows a curtain runner to run and is downward inclined from the base side towards a front end side, and a pull-out-prevention portion 3 at the front end. The decoration portion 2 has a peak at an intermediate part, and is downward curved from the peak to the base side and the front end side.