| 摘要 |
A glass substrate for an information recording medium has a rotational center (CP) and is provided with principal surfaces and an outer peripheral end surface. The difference between the maximum and minimum values in a circumferential distribution of amount of offset relative to a reference position as a radius position is 40 nm or less on both the front and rear surfaces, and the difference between the mean of the circumferential distribution of amount of offset on the front side and the mean of the circumferential distribution of the amount of offset on the rear side is 10 nm or less, where R is the radius of the glass substrate (1G), the reference position is a point (R3) on a reference line (BL) that is 0.99R away from the rotational center (CP), and the amount of offset is the distance to the reference position from a point on a principal surface overlapping the reference position when viewed along the direction of extension of a rotational axis (L1) that passes through the rotational center (CP). |
