The invention provides a nonaqueous electrolyte secondary battery separator. As a nonaqueous electrolyte secondary battery separator with excellent high-rate performance, the tensile creep compliance value J when t seconds of 30MPa stress is applied satisfies one or more of following three conditions: (i) t= 300 seconds, J = 4.5 to 14.0 GPa-1, (ii) t = 1800 seconds, J = 9.0 to 25.0 GPa-1, (iii) t = 3600 seconds, J = 12 .0 to 32.0GPa-1.