Patent ID: 7488258

Claim:
A universal joint boot comprising: a boot body including a cylindrical bellows part having valleys and peaks formed continuously in a repetitive manner for extension and contraction and an opening portion formed in one end of the bellows part; and an annular adaptor mounted on an inner peripheral surface of the opening portion and having an outer peripheral surface formed nearly in a same shape as the inner peripheral surface, the adaptor being rubber or elastic plastic having: a fixing portion pressed by the inner peripheral surface of the opening portion of the boot body; a reversing portion located opposite to the fixing portion with the opening portion being located between the fixing portion and the reversing portion and sandwiching the opening portion together with the fixing portion; and a folding portion located between the reversing portion and the fixing portion, the reversing portion and the folding portion being thinner than the fixing portion to facilitate folding over of the reversing portion at the folding portion.