DUST COVER, SUSPENSION DEVICE AND DUST COVER MANUFACTURING METHOD

Provided are a dust cover that uses a thermoplastic resin and ensures strength of a flange portion, a suspension device including the dust cover, and a method for manufacturing the dust cover. A substantially cylindrical dust cover (6) is formed of a thermoplastic resin formed by blow molding and covers an outer side of a damper (3 extending in a predetermined direction. The dust cover (6) includes bellows portions (61) that are inclined alternately toward a radially outer side and a radially inner side in an axial direction and can expand and contract in the axial direction, and a flange portion (63) that extends radially outward from a cylindrical portion of the dust cover (6). The flange portion (63) protrudes radially outward from the cylindrical portion of the dust cover (6) by a dimension larger than a height dimension in a radial direction between a radially inner end and a radially outer end of each of the bellows portions (61), and a thickness of the flange portion (63) is larger than a thickness of the radially outer end of each of the bellows portions (61).