| 摘要 |
The present invention is directed to providing a shock absorber for a vehicle that can have required shock absorption performance while being superior in the shock absorption performance immediately after application of a shock and keeping the shock absorption performance high. A shock absorber for a vehicle 1 absorbs shock energy at the time of collision by being internally provided in a vehicle constituent member. The shock absorber for a vehicle 1 includes a first wall 4 that is subjected to a shock, a second wall 5 spaced apart from and opposed to the first wall 4 with a hollow portion 2 interposed therebetween, and one or two or more shock absorption ribs 9 each including a deep groove 15 having a welding surface formed therein by respectively depressing the first wall 4 and the second wall 5 into recessed groove shapes and integrally joining their respective front end surfaces to each other and a shallow groove 16 formed by opposing the front end surfaces with a distance apart from each other.
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