Detergent composition for automatic dishwashing machines

A detergent composition for automatic dishwashing machines, comprising (A) particles comprising 0.05 to less than 5% by mass of (a) a polymer compound having a monomer unit with a cationic group and another monomer unit with an anionic group at a molar ratio [the total number of moles of cationic groups]/[the total number of moles of anionic groups] of 50/50 to 90/10, the content of the polymer compound (a) in the detergent composition being 0.05 to 1.5% by mass;

• wherein the particles (A) comprise a solid water-soluble organic compound and a water-soluble inorganic salt in a content of 85 to 99.9% by mass, and the solid water-soluble organic compound/water-soluble inorganic salt ratio by mass is in the range of 50/50 to 10/90;
• wherein the solid water-soluble organic compound is a citric acid or a salt thereof;
• wherein the water-soluble inorganic salt is at least one member selected from the group consisting of a sulfate, a hydrochloride and a phosphate;
• wherein the monomer unit with a cationic group is a monomer unit obtained by polymerizing N,N-diallyl-N,N-dialkyl (C1 to C3) quaternary ammonium salt or a monomer unit obtained by polymerizing N,N-diallyl-N-alkyl (C1 to C3) amine and alkylated with a quaternarizing agent;
• and wherein the monomer unit with an anionic group is a monomer unit selected from the group consisting of acrylic acid or a salt thereof, methacrylic acid or a salt thereof, maleic acid or a salt thereof, and maleic anhydride.