To provide a thermoplastic resin film which yields an optical member (film) having decreased optical defects when used particularly for optical applications and improves productivity.

In order to store the thermoplastic resin film, the thermoplastic resin film in the form of a taken-up roll used for optical applications is stored in an atmosphere in which a temperature changing range is within 10°C and/or a temperature change rate per hour is within ±5°C.