| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a helmet at a low cost by realizing a ventilation duct capable of ventilating efficiently by using the same member regardless of sizes of helmets.SOLUTION: A ventilation duct 1 comprises: a left duct part 3L and a right duct part 3R which are provided on the left and right of a cap body A1 respectively; and a central duct part 2 which is provided between the left and right duct parts 3L and 3R. Engagement supporting members 4L and 4R, which are set at the arrangement positions of the left and right duct parts 3L and 3R in an exterior surface A10 of the cap body A1, and the central duct part 2, limit the movement of the left and right duct parts 3L and 3R to the front and rear direction of the cap body A1 and the left and right direction thereof, and to the direction of separating from the cap body A1, and hold them.</p> |
