Patent ID: 7018193

Claim:
A die for molding disc substrates in which a stamper is held by at least one of a stationary die and a movable die, wherein, in a said stamper, a to-be-held surface that diverges continuously from an inner circumferential surface of a center hole is formed between said inner circumferential surface and an inner circumferential side head surface, an inner stamper holder that holds the inner circumferential side of said stamper is comprised of: a cylindrical body portion; and a claw portion formed around an outer circumference of an end of said cylindrical body portion, and in said claw portion, a cavity forming surface which is substantially parallel to the inner circumferential side head surface of said stamper and on which an outer circumferential portion is formed so that it is projected from a cylindrical surface of said cylindrical body portion in a direction perpendicular to an axis line by 30–60 μm at room temperature, and a holding surface which has a base portion having a dimension of 50–150 μm in the axial direction at room temperature and which diverges from a connection point on said base portion toward said outer circumferential portion of said cavity forming surface in a tapered fashion are formed.