To provide a negative-ion building material which promotes the generation of a natural minus ion from a surface layer part of the building material, which can bring about the effects of environmental improvement and health promotion, and which is excellent in the glossiness and slip resistance of a surface.

In this negative-ion building material 1, the surface layer part of the building material 2 is coated with a first resin wax 8 into which a minus ion generating substance 4 is mixed, and a second resin wax 9, which does not contain the substance 4, is applied onto the wax 8.