Patent ID: 7530575

Claim:
A boot comprising: a boot body including a cylindrical large-diameter portion, which forms a cylindrical shape, a cylindrical small-diameter portion, which is spaced from and arranged coaxially with the cylindrical large-diameter portion and forms a cylindrical shape having a diameter that is smaller than that of the cylindrical large-diameter portion, and a bellows portion, which forms a shape of a hollow bellows and couples the cylindrical large-diameter portion and the cylindrical small-diameter portion integrally; and a fastening member, which is a single wall cylindrical member and is coaxially integrated with the cylindrical small-diameter portion, wherein the fastening member has a fastening leading end portion, which is opposite in an axial direction from the cylindrical large-diameter portion, and a fastening tail end portion, which is located on an end of the fastening member that corresponds to the cylindrical large-diameter portion; a notch is formed in the fastening leading end portion: the fastening tail end portion is continuous around the entire circumference of the fastening member; an inner peripheral surface of the fastening tail end portion contacts the cylindrical small-diameter portion; the diameter of at least one of the fastening leading end portion and the fastening tail end portion increases or decreases by elastic deformation; and when the diameter of the fastening leading end portion or the fastening tail end portion increases, the fastening member forms the shape of a trumpet.