To provide a gypsum board capable of adsorbing formaldehyde and offering good exterior appearance.
The gypsum board 10 is manufactured by pouring slurry obtained by mixing the raw materials such as gypsum or the like together with water into the gaps in base paper 12 and then forming and drying; and the base paper 12 is arranged on the front and rear surfaces of the gypsum core layer 11. Near the boundary between the base paper 12 and the gypsum core layer 11, an adsorption region 13 is formed from the center portion of the base paper 12 to the outer surface side of the gypsum core layer 11 as to the thickness direction of the gypsum board 10. This adsorption region 13 is formed by pouring main slurry S1 after coating slurry S2 containing a high concentration of formaldehyde has been applied on surface of the inner surface sides of the base paper 12, therefore, yellowish colors or uneven colors caused by coating the formaldehyde adsorbing agent as conventionally occurred can be fully avoided and the gypsum board 10 with excellent exterior appearance can be produced.
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