To provide a method for manufacturing a glass-like carbon substrate for recording medium excellent in smoothness, by which problems on the conventional art are solved, without lowering the yield at the time of calcination.

This manufacturing method for the glass-like carbon substrate for recording medium is constituted for manufacturing the glass-like carbon substrate for recording medium by calcining a substrate-shaped raw material resin plate P for the recording medium and carbonizing the raw material resin plate P into a glass form after the raw material resin plate P is formed of the glass-like carbon material resin. In this case, the calcination of the raw material resin plate P is executed by being held with a calcining jig excellent in flatness and smoothness.