An ink composition includes a wetting agent and water-insoluble polymer particles including a colorant and a water-insoluble polymer, wherein the content of free polymer derived from the water-insoluble polymer is 1.0% by mass or less with respect to the total mass of the ink composition, and the wetting agent is at least one selected from the group consisting of urea, a urea derivative, a pyrrolidone derivative, an alkyl glycine represented by the following Formula I, glycyl betaine and a sugar: (Formula I) R1 R2NCH2COOM wherein in Formula I, R1 and R2 each independently represent a linear or branched alkyl group having 1 to 5 carbon atoms, and M represents a hydrogen atom, an alkali metal atom or an alkaline earth metal atom.