To provide a detergent composition excellent in detergency to fine particles sticking on the surface of a material to be washed and in rinsability in a water-rinsing process after washing.

A detergent composition is composed of: a) 0.5-15 wt.% of a phosphate; b) 0.1-20 wt.% of one or two or more of surfactants selected from the group A; and a residual part of water. Group A: polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene alkylcyclohexyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkylamine, sulfonate, and polyoxyethylene alkyl ether sulfonate.