We have developed a low-cost photocatalyst responsive to visible light and applicable to fiber, textile and plastics. The novel photocatalyst is composed of titanium dioxide, apatite and iron. It showed excellent activities of acetoaldehyde decomposition, NOx removal and anti-bacterial effect under visible light as well as UV light. The acetoaldehyde decomposition activity of the novel photocatalyst is 5.9 times higher than that of the conventional titanium dioxide photocatalyst under fluorescent lamp. Although photocatalysts responsive to visible light are usually yellow, the novel photocatalyst is almost white and it does not change color when it is coated on a white object. The novel photocatalyst helps to expand the market of photocatalytic products, because it makes possible its use for various indoor applications which were difficult to be realized by conventional photocatalysts.