The invention aims at enabling degradation of quality of a regenerative signal due to repetitive overwrite in a high temperature environment to be evaluated based on an inspection under a room temperature environment for a repetitively rewritable phase-change type optical recording medium. Overwrite is repetitively performed to the same track with a laser power which is a given value larger than a laser power with which jitter in a regenerative signal becomes minimum at a room temperature for a phase-change type optical recording medium in which a recording layer made of a material in which a phase change between a crystalline state and an amorphous state is caused due to a difference in applied laser power is provided. A jitter value of the regenerative signal after the overwrite is repetitively performed the given number of times is measured and it is judged whether or not the measured jitter value is equal to or smaller than a reference value, thereby evaluating degradation of quality of the regenerative signal.