A magnetic disc medium comprising: a magnetic sheet in the form of a disk; a case encasing the magnetic sheet so as to be capable of rotating; and a nonwoven liner fastened on an inner face of the case so as to face the magnetic sheet, wherein the magnetic sheet comprises a support, a substantially nonmagnetic lower layer, and a magnetic layer containing hexagonal ferrite powder dispersed in a binder and having central plane average surface roughness of from 1 nm to 4 nm, and the liner comprises polyethylene terephthalate in an amount of 20% by weight or more.