Method of attaching clip to blow molded article and the clip

A method of attaching a clip to a tubular blow molded article, comprising the steps of:

• preparing a clip including a clip body and a clip base which is provided at a base portion of the clip body and has a side wall and a plurality of hollows, each hollow being separated from another hollow by at least one intermediate portion, and a plurality of through-holes extending through the side wall and the at least one intermediate portion for communicating with each hollow;
• inserting the clip body of the clip into a cavity formed on a molding surface of a mold such that the clip base projects from the molding surface;
• setting softened synthetic resin into the mold;
• and
• bringing the synthetic resin into close contact with the molding surface of the mold by blow molding at a blow pressure so as to deliver the synthetic resin to each hollow and the plurality of through-holes of the clip base such that the synthetic resin is filled into each hollow and the plurality of through-holes of the clip base, whereby the synthetic resin is molded to a blow molded article having the clip projecting from its outer peripheral surface.