According to the present invention, provided are a curable composition containing a (A) compound which has a structure having two or more cyclic ether groups, in the molecule and a linking group linking the cyclic ether groups, which contains an alkylene group having 4 or more carbon atoms, or a curable composition containing a compound which has, in the molecule, two or more moiety structures containing 4-membered or more cyclic ether and a moiety structure represented by the following formula (Y-I), and an ink composition comprising the curable composition and a compound represented by the following formula (i). ##STR00001##