To provide a photocatalyst-functional material having both a high adsorption property for organic materials and a photocatalytic activity, and excellent in usability and durability.

The glass ceramic includes: apatite type crystal and one or more crystal(s) selected from TiO₂ crystal, WO₃ crystal, RnNbO₃ crystal, RnTaO₃ crystal (Rn is one or more kind(s) selected from Li, Na and K), RNb₂O₆ crystal, RTa₂O₆ crystal (R is one or more kind(s) selected from Be, Mg, Ca, Sr, Ba and Zn), ZnO crystal, NASICON type crystal, Bi₂O₃ crystal, B_i2WO₆ crystal, Bi₂W₂O₉ crystal, B_i2W₃O₁₂ crystal, B_i2MoO₆ crystal, B_i2Mo₂O₉ crystal, Bi₂Mo₃O₁₂ crystal, B_i2T_i2O₇ crystal, Bⁱ²Ti₄O₁₁ crystal, B_i4T_i3O₁₂ crystal, B_i12TiO₂₀ crystal, BiNbO₄ crystal, B_i2F_e4O₉ crystal, BiVO₄ crystal, LiBiO₃ crystal, and solid solutions thereof.