| 摘要 |
PROBLEM TO BE SOLVED: To prevent the rattling of an operation member by guiding the operation member to be moved to the operating direction. SOLUTION: A guide protrusion 15 extending to the operating direction of an operation knob 11 is divided into first and second linearly protruded portions 15a, 15b having a different width. The first and second linearly protruded portions are set to be long enough not to require a draft in molding, and they can thus be formed in uniform-width linear shape. A guide groove 17 to which the guide protrusion is movably fitted is also divided into first and second linearly grooved portions 17a, 17b having a different width. The first and second linearly grooved portions 17a, 17b are also set to be long enough not to require a draft in molding, and they can thus be formed in uniform-width linear shape. Even if the guide protrusion 15 and the guide groove 17 are long in the operating direction of the operation knob 11, the rattling of the operation knob 11 is kept to the minimum.
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