Abstract: When an operation knob 10 formed of silicone rubber is pushed laterally, a stem 7 tilts with a contact portion (i) as a fulcrum, a push button portion 6b is pushed, and a contact point in a switch mechanism portion 6a operates to turn on a switch circuit. Even if, by a large operating force F3 being applied, the operation knob 10 is extended and the inner surface portion 15, which is a ceiling surface of an internal space 13 of the operation knob 10, rides on an upper end portion 7c, a reinforcing surface 19 provided on the inner surface portion 15 slides on the upper end portion 7c, and the operation knob 10 returns to the initial shape.

Abstract: A vehicle wheel 1 having a plurality of subsidiary air chambers 3, which is annularly incorporated on a rim outer peripheral surface 4, a cover member 13 having a lug part extended over the entire periphery and a stepped part extended over its periphery along the inside of the lug part 16, and a bottom plate member 14 being superimposed with each other through a seal member made of an elastic member and interposed therebetween in an airtight manner, and the cover member 13 and the rim outer peripheral surface 4 being joined to each other in a joint part 10, wherein the cover member 13 and the rim outer peripheral surface 4 are made into contact with each other so as to form a subsidiary air chamber 3 having air-tightness.