| 摘要 |
An airbag cover main body portion is provided including a plate-shaped opening portion, a flat portion provided to at least a region further on an inner peripheral side than the opening portion, and a plurality of welding auxiliary ribs that is provided to protrude from a region further on an outer peripheral side than the opening portion and maintain a flatness of a surface of the opening portion, wherein: a frame-shaped body includes a flap portion that tears and deploys by pressure imparted by an inflation load, ribs to be welded that are provided at least to the flap portion, facing the flat portion, and a plurality of auxiliary ribs to be welded; and the ribs to be welded and the flat portion as well as the auxiliary ribs to be welded and the welding auxiliary ribs are respectively joined by vibration welding while respectively in contact with each other.
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