Glass composition

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A radiation shielding glass free from lead component and containing rare earth oxides in large amounts that exhibits shielding capability comparable to that of lead glass and has high surface hardness, being extremely high in the transparency in visible region. There is provided a glass composition comprising more than 5% to 35%, by mass% on oxide basis, of the sum of Al2O3 and/or Ga2O3 and/or In2O3 and exhibiting a lead equivalent to 150 kV X-rays of 0.03 mmPb/mm or greater. The glass density can be increased by incorporating 20 to 90% of Ln2O3 (wherein Ln is at least one member selected from the group consisting of Y, La, Gd, Dy, Yb and Lu). Thus, there can be obtained a glass composition that has high radiation shielding capability and high surface hardness, being highly transparent in visible region.