Boot for constant-velocity universal joint

A boot for constant-velocity universal joint, comprising:

• a minor-diameter cylindrical portion having opposite ends and inside and outside diameters, and being retained to a shaft;
• a major-diameter cylindrical portion having opposite ends and inside and outside diameters that are larger than the inside and outside diameters of the minor-diameter cylindrical portion, and being disposed separately away from the minor-diameter cylindrical portion and coaxially therewith;
• a bellows connecting the minor-diameter cylindrical portion with the major-diameter cylindrical portion integrally, and having opposite ends and an overall outer configuration being formed as a truncated cone shape substantially;
• the bellows comprising a plurality of crests and roots being made of a first crest, a first root, a second crest, a second root, and so on, which are disposed alternately in this order from one of the opposite ends that faces the minor-diameter cylindrical portion to the other one of the opposite ends that faces the major-diameter cylindrical portion;
• and
• the bellows further comprising a rising wall connecting one of the opposite ends of the minor-diameter cylindrical portion that faces the bellows with a top of the first crest in the bellows, and exhibiting a rising angle of less than 45 degrees to an imaginary central line of the boot or that of the shaft.