An antifouling coating composition having a low friction performance, comprising: - a resin binder; - water or a solvent; and - an organic polymer particle dispersed in said water or solvent, wherein said resin binder is at least one kind of resin selected from the group consisting of -- an acrylic resin having a side chain expressed by the following general formula; -COO-M-OOC-A, wherein M is a divalent or higher valent metal and A is an organic acid residue of a monobasic acid; -- an acrylic resin having a side chain expressed by the following general formula; wherein R 1, R 2 and R 3 are the same or different from one another and represent an isopropyl group or a n-butyl group; -- an acrylic resin having at least one group expressed by said general formula on the side chain and having at least one group expressed by said general formula on the side chain; and -- an acrylic resin having a crosslinking structure expressed by the following formula: (-COO-M-OCO-), wherein M is a divalent metal, - said organic polymer particle has the solubility at 23°C in the artificial seawater specified in ASTM D1141-98 of 15 g/liter or less, the water-absorbing amount for the artificial seawater specified in ASTM D1141-98 of 0.01% by mass or more and a particle diameter of 0.05 to 100 μm, and the content of the organic polymer particle is 0.01 to 15% by mass with respect to the solid matter of the antifouling coating composition. - a resin binder; - water or a solvent; and - an organic polymer particle dispersed in said water or solvent, wherein said resin binder is at least one kind of resin selected from the group consisting of -- an acrylic resin having a side chain expressed by the following general formula; -COO-M-OOC-A, wherein M is a divalent or higher valent metal and A is an organic acid residue of a monobasic acid; -- an acrylic resin having a side chain expressed by the following general formula; wherein R 1, R 2 and R 3 are the same or different from one another and represent an isopropyl group or a n-butyl group; -- an acrylic resin having at least one group expressed by said general formula on the side chain and having at least one group expressed by said general formula on the side chain; and -- an acrylic resin having a crosslinking structure expressed by the following formula: (-COO-M-OCO-), wherein M is a divalent metal, -- an acrylic resin having a side chain expressed by the following general formula; -COO-M-OOC-A, wherein M is a divalent or higher valent metal and A is an organic acid residue of a monobasic acid; -- an acrylic resin having a side chain expressed by the following general formula; wherein R 1, R 2 and R 3 are the same or different from one another and represent an isopropyl group or a n-butyl group; -- an acrylic resin having at least one group expressed by said general formula on the side chain and having at least one group expressed by said general formula on the side chain; and -- an acrylic resin having a crosslinking structure expressed by the following formula: (-COO-M-OCO-), wherein M is a divalent metal, - said organic polymer particle has the solubility at 23°C in the artificial seawater specified in ASTM D1141-98 of 15 g/liter or less, the water-absorbing amount for the artificial seawater specified in ASTM D1141-98 of 0.01% by mass or more and a particle diameter of 0.05 to 100 μm, and the content of the organic polymer particle is 0.01 to 15% by mass with respect to the solid matter of the antifouling coating composition.