A curable composition comprising: (A) an infrared absorber which is a cyanine dye having a structure in which hetero rings are bonded to each other via a methine chain and which has at least one substituent having a structure selected from the group consisting of an amide bond, a urethane bond, a urea bond and a sulfonamide bond on at least one of aromatic rings at both ends, nitrogen atoms present on the hetero rings at both ends and the methine chain; (B) at least one of a radical generator and an acid generator; and (C) at least one of a radical polymerizable compound and an acid crosslinking agent.