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Abstract

Provided are: a 4-methyl-1-pentene copolymer composition (X) that contains 50-90 parts by mass of a 4-methyl-1-pentene-based polymer (A) in which the melting point measured by DSC falls within a range of 200-250°C, 5-30 parts by mass of a 4-methyl-1-pentene-based polymer (B) in which the melting point measured by DSC is less than 200°C or the melting point is not measured, and 5-30 parts by mass of a thermoplastic elastomer (C) other than (A) and (B) and that satisfies requirements (a) and (b); and a method for manufacturing a molded body and a rubber hose that are formed of the composition (X). Requirement (a): the tanδ peak temperature determined by means of dynamic viscoelasticity measurement at 0-240°C and a frequency of 10 rad/s is 0-60°C. Requirement (b): the tanδ peak value determined by means of dynamic viscoelasticity measurement at 0-100°C and a frequency of 10 rad/s is 0.15-0.8.

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