Injection molded article, lining tube and lining valve

An injection molded article comprising a pipe body section forming a flow path of a fluid, and a flange section formed on one end or both ends of the pipe body section, wherein

• the maximum thickness of the flange section is 2 to 12 mm,
• the injection molded article comprises a copolymer comprising tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit,
• a content of the fluoro(alkyl vinyl ether) unit of the copolymer is 2.8 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of the copolymer is 4.0 g/10 min or higher and lower than 11.0 g/10 min, and the total number of —CF═CF2, —CF2H, —COF, —COOH, —COOCH3, —CONH2 and —CH2OH of the copolymer is 50 or less per 106 main-chain carbon atoms.