| 摘要 |
PROBLEM TO BE SOLVED: To provide an air duct capable of improving a degree of freedom in designing while ensuring a distributed air amount and a flow rate by distributing the air without using an independent partitioning board, reducing the manufacturing cost by using an inexpensive manufacturing means such as blow molding, and further reducing the pressure loss to improve the air blowing efficiency and to reduce the wind noise, whereby the environmental condition in the cabin can be improved. SOLUTION: A main duct 11 is provided with a distribution wall 21 composed of a distribution groove 15 formed by inwardly recessing the main duct from an outer face side to a depth not reaching an opposite inner face, the distribution wall 21 is extended from the neighborhood of an air conditioning unit connecting part 16 as an inlet side to a branch 14 between a center connecting part 17 and a side connecting part 18, and the inside of the main duct 11 is divided into plural guide passages (a center guide passage 22 and a side guide passage 23) while communicated by a communication passage A.
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