This invention is intended to provide a photocatalytic coating material
which includes: at least (a) photocatalytic oxide particles; (b) a
hydrophobic-resin emulsion; and (c) water, wherein the average particle
size of the photocatalytic oxide particles is smaller than that of the
particles dispersed in the hydrophobic-resin emulsion. This invention is
also intended to provide a self-cleaning water-base coating composition
which includes: (a) water-based silicone emulsion or the like; (b)
photocatalytic particles or a photocatalytic sol; and (c) water, wherein
the solid matter of the ingredient (b) constitutes less than 5% by weight
of the total solid matter of the coating composition. This invention is
also intended to provide a self-cleaning water-base coating composition
which includes: (a) water-based silicone emulsion or the like; (b)
whisker or the like; (c) photocatalytic particles; (d) an inorganic
coloring pigment; and (e) water.