To provide a manufacturing method of a cover, molded form and molding die which can suppress cost increase for the production of a cover by blow molding.SOLUTION: A manufacturing method of a cover is made up of two steps. The first step is to produce a molded form 100 by blow molding, including a first cover part 102 and a second cover part 104, which are used for a cover, and a first cut-off part 103, which is in contact with the first cover part 102 and the second cover part 104. The second step is to cut the molded form 100 and detach the first cover part 102, the first cut-off part 103 and the second cover part 104.SELECTED DRAWING: Figure 11【課題】ブロー成形を用いたカバーの製造において、製造コストの増加を抑制できるカバーの製造方法、成形品、及び成形用の金型を提供する。【解決手段】カバーの製造方法は、カバーに用いられる第１カバー部１０２及び第２カバー部１０４、並びに第１カバー部１０２及び第２カバー部１０４に接する第１切り取り部１０３を有する成形品１００をブロー成形により成形する工程と、成形品１００を切断して、第１カバー部１０２と第１切り取り部１０３と第２カバー部１０４とをそれぞれ切り離す工程とを備える。【選択図】 図１１
