To provide a gypsum board having antibacterial properties and gas adsorbability by reutilizing waste containing a silicic acid component and/or an aluminum component.

An artificial zeolite composition is synthesized from waste containing a silicic acid component and/or an aluminum component to be substituted with polyvalent cations, and antibacterial cations are further supported on this composition. The resulting composition is mixed with a baked gypsum slurry and/or raw material to provide a gypsum board having antibacterial properties and gas adsorbability.