A glass substrate for an information recording disk

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PROBLEM TO BE SOLVED : To provide a glass substrate for information recording disk having high mechanical characteristics and excellent in chemical stability, thermal stability, smoothness and transparency. SOLUTION : The glass substrate comprises glass containing at least one rare earth element selected from the group comprising Sc, Y, La, Pr, Nd, Pm, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb and Lu. An information recording layer is disposed on at least a part of the surface of the glass substrate.