| 摘要 |
In a lamp body (25) to which a switch knob (3) is attached, an opening (19) corresponding to the switch knob (3) is formed. Opening (19) has opposing sidewalls (20a, 20b), and on each of the sidewalls, three grooves (21a, 21b) are provided. On one surface of a knob body (27) of the switch knob (3), a pair of projecting pieces (31a, 31b) are provided spaced from each other by such a distance that allows the projecting pieces to be in contact with the sidewalls (20a, 20b) of the opening (19), and at each of the projecting pieces, a beam portion (33a, 33b) is formed. On each of the beam portions (33a, 33b), a projection (35a, 35b) is provided on the outer surface, and stable engagement with the vertical groove (21a, 21b) is realized. <IMAGE> |
