The disclosed resin dispersion for an antifouling coating has excellent water resistance in sea water and storage stability can display an antifouling effect over the long term and has self polishing properties with excellent adhesiveness. The method for producing the resin dispersion for an antifouling coating includes a step for producing a polymer (A) containing a bivalent metal and a step for dispersing said polymer (A) in a dispersion medium comprising water or a mixture of water and an organic solvent and is characterized by the polymer (A) containing a bivalent metal being obtained through multi stage (at least two stages) solution polymerization of: 1 40 mass % of a bivalent metal containing ethylenic unsaturated monomer unit (a1) 0 8 mass % of a carboxyl group containing ethylenic unsaturated monomer unit (a2) 0 40 mass % of a hydroxyl group containing ethylenic unsaturated monomer unit (a3) and 99 22 mass % of another ethylenic unsaturated monomer unit (a4).
