A high heat-resistance resin composition, the high heat-resistance resin composition being thermally treated at 150.degree. C. for 100 hours, wherein a heat absorption amount of the high heat-resistance resin composition which is measured at a melting point thereof by Differential Scanning Calorimetry (DSC) is equal to or less than 45 J/g before thermal treatment, an increasing rate of the heat absorption amount of the high heat-resistance resin composition which is measured at a melting point thereof after the thermal treatment by Differential Scanning Calorimetry (DSC) is equal to or less than 20% as compared to that before the thermal treatment, and a degree of extensibility thereof is equal to or more than 200% after the thermal treatment.

 
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