An active energy ray-curable ink composition comprising: (component A) monofunctional radically polymerizable monomers, (component B) a polyfunctional oligomer having a glass transition temperature of 20°C or lower and an acrylate value of 300 g/value or more, and having a partial structure represented by the following formulae (b-1) or (b-2), and (component C) a bifunctional radically polymerizable monomer having a viscosity at 25°C of 15 mPa·s or less, wherein the component A includes an N-vinyl compound and a compound represented by the following formula (I), the content of the N-vinyl compound with respect to the total amount of the ink composition is from 10 to 50% by mass, the content of the component A with respect to the total amount of the ink composition is 70% by mass or more, and the component of the component C with respect to the total amount of the ink composition is from 0.5 to 3 % by mass: wherein R represents a hydrogen atom or a methyl group, A 1 to A 4 , B 1 to B 4 , and C 1 to C 3 each independently represent a hydrogen atom or an alkyl group, A 1 or A 2 , and A 3 or A 4 may be bonded to each other to form a ring, B 1 or B 2 , and B 3 or B 4 may be bonded to each other to form a ring, any one of C 1 to C 3 and any one of A 1 to A 4 and B 1 to B 4 may be bonded to each other to form a ring, and X represents a single bond or a divalent linking group, wherein X's each independently represent a urethane bond, an ester bond, an ethyleneoxy (EO) group, a propyleneoxy (PO) group, or an alkylene group, and * represents the bonding position, wherein Y's each independently represent an ester bond, an ether bond, a carbonyl group, an alkylene group, or a group formed by a combination of two or more out of these groups, and * represents the bonding position, wherein the active energy ray-curable ink composition is other than the active energy ray-curable ink composition of examples 17, 18, 19, 21, 22, 26, 27, 28, 35, 36, 37, 41, 42, 43, 44, and 45 of EP2 644 664 A1. (component A) monofunctional radically polymerizable monomers, (component B) a polyfunctional oligomer having a glass transition temperature of 20°C or lower and an acrylate value of 300 g/value or more, and having a partial structure represented by the following formulae (b-1) or (b-2), and (component C) a bifunctional radically polymerizable monomer having a viscosity at 25°C of 15 mPa·s or less, wherein the component A includes an N-vinyl compound and a compound represented by the following formula (I), the content of the N-vinyl compound with respect to the total amount of the ink composition is from 10 to 50% by mass, the content of the component A with respect to the total amount of the ink composition is 70% by mass or more, and the component of the component C with respect to the total amount of the ink composition is from 0.5 to 3 % by mass: wherein R represents a hydrogen atom or a methyl group, A 1 to A 4 , B 1 to B 4 , and C 1 to C 3 each independently represent a hydrogen atom or an alkyl group, A 1 or A 2 , and A 3 or A 4 may be bonded to each other to form a ring, B 1 or B 2 , and B 3 or B 4 may be bonded to each other to form a ring, any one of C 1 to C 3 and any one of A 1 to A 4 and B 1 to B 4 may be bonded to each other to form a ring, and X represents a single bond or a divalent linking group, wherein X's each independently represent a urethane bond, an ester bond, an ethyleneoxy (EO) group, a propyleneoxy (PO) group, or an alkylene group, and * represents the bonding position, wherein Y's each independently represent an ester bond, an ether bond, a carbonyl group, an alkylene group, or a group formed by a combination of two or more out of these groups, and * represents the bonding position, wherein the active energy ray-curable ink composition is other than the active energy ray-curable ink composition of examples 17, 18, 19, 21, 22, 26, 27, 28, 35, 36, 37, 41, 42, 43, 44, and 45 of EP2 644 664 A1. <EOS>