the shafts 42 and 43 of the retainer 14 a from the predetermined direction to axially support the grip main body 12 in this condition the oil damper 16 is being stored in the space 60 which is formed between the projecting portion 41 of the retainer 14 a and the wall portion 50 of the grip main body 12 by merely engaging the projections 66 of the inner shaft 62 with the groove 44 and by engaging the elongated projection 68 of the outer cylinder 64 with the elongated groove 56 so that the assembly is completed therefore the assembly is simplified also in case the present invention is applied to the assist grip 10 as in the embodiment the load applied to the grip main body 12 does not directly acts on the oil damper 16 so that the normal damping force can be obtained for a long period of time further in the embodiment of the invention since the oil damper 16 is held by the elastic piece 46 of the retainer 14 a even if the vibration or the impact is applied to the oil damper the oil damper is not easily disengaged also since the elastic piece 46 is integrally formed with the retainer 14 a the structure thereof is simple and can be manufactured at a low cost also the assembly of the oil damper 16 can be made easily incidentally although the shafts 42 and 43 are formed at the retainer side and the through holes 52 and 53 are formed at.