An ink composition is provided that includes (A) a pigment, (B) a polymerizable monomer, (C) a polymerization initiator, and (D) a dispersant, the content of the pigment being no greater than 1 wt % of the entire ink composition, and the ratio (D/A) of the weight A of the pigment to the weight D of the dispersant in the ink composition satisfying the relationship 0.5