PURPOSE: To stably exhibit a stereoscopic pattern.

CONSTITUTION: A frame member 1 having a groove 4 adapted to be fitted therein with a glass pane, the fitting groove 4 having an inner groove wall 2 and an outer groove wall 3 in a double structure such that hollow space parts 20, 30 are defined between inner pieces 2a, 3a and outer pieces 2b, 3b. uneven streaks 7a, 7b are formed on opposite sides of the outer pieces, in parallel with the longitudinal direction of the frame member 1, the thickness (t) of the outer piece between the streaks 7a, 7b is thinner than a normal wall thickness T, and accordingly, a stereoscopic pattern 7 having repetitions of inward and outward unevenness which extends in a push-out direction can be exhibited on the thin wall outer piece with no secondary processing.