A photocurable ink composition comprising: a resin that includes at least one of a structural unit below or a structural unit below; and at least one of a monofunctional radical-polymerizable monomer or a bifunctional radical-polymerizable monomer, wherein a total content of the monofunctional radical-polymerizable monomer and the bifunctional radical-polymerizable monomer is 50% by mass or more relative to a total amount of the photocurable ink composition: wherein, in the structural unit, R 1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, two Y 1 each independently represent a single bond or a divalent organic group having 1 to 20 carbon atoms, two Z 1 each independently represent a single bond, a carbonate bond, an amide bond, or a urethane bond, two ∗ each represent a binding site, and provided that, in a case where one of two Z 1 is a single bond, the other is not a single bond, and wherein, in the structural unit, R 1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R 2 represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, X represents an ether bond or an ester bond, Y 2 represents a trivalent organic group having 1 to 20 carbon atoms, two Z 2 each independently represent a single bond, an ester bond, a carbonate bond, an amide bond, or a urethane bond, two ∗ each represent a binding site, and provided that, in a case where one of two Z 2 is a single bond, the other is not a single bond. a resin that includes at least one of a structural unit below or a structural unit below; and at least one of a monofunctional radical-polymerizable monomer or a bifunctional radical-polymerizable monomer, wherein a total content of the monofunctional radical-polymerizable monomer and the bifunctional radical-polymerizable monomer is 50% by mass or more relative to a total amount of the photocurable ink composition: wherein, in the structural unit, R 1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, two Y 1 each independently represent a single bond or a divalent organic group having 1 to 20 carbon atoms, two Z 1 each independently represent a single bond, a carbonate bond, an amide bond, or a urethane bond, two ∗ each represent a binding site, and provided that, in a case where one of two Z 1 is a single bond, the other is not a single bond, and wherein, in the structural unit, R 1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R 2 represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, X represents an ether bond or an ester bond, Y 2 represents a trivalent organic group having 1 to 20 carbon atoms, two Z 2 each independently represent a single bond, an ester bond, a carbonate bond, an amide bond, or a urethane bond, two ∗ each represent a binding site, and provided that, in a case where one of two Z 2 is a single bond, the other is not a single bond. R 1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, two Y 1 each independently represent a single bond or a divalent organic group having 1 to 20 carbon atoms, two Z 1 each independently represent a single bond, a carbonate bond, an amide bond, or a urethane bond, two ∗ each represent a binding site, and provided that, in a case where one of two Z 1 is a single bond, the other is not a single bond, and wherein, in the structural unit, R 1 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R 2 represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, X represents an ether bond or an ester bond, Y 2 represents a trivalent organic group having 1 to 20 carbon atoms, two Z 2 each independently represent a single bond, an ester bond, a carbonate bond, an amide bond, or a urethane bond, two ∗ each represent a binding site, and provided that, in a case where one of two Z 2 is a single bond, the other is not a single bond.