Provided are a curing accelerator for an oxidative polymerization type unsaturated resin having a high curing accelerating ability, and a printing ink and a coating material. Specifically, there are provided a curing accelerator for an oxidative polymerization type unsaturated resin, containing a metal complex (β) having an anion compound (α) represented by the following structural formula (1-1) or (1-2) as a ligand: wherein R1 is any one of a hydroxyl group, an amino group, a nitro group, a nitroso group, a sulfo group, a halogen atom, a hydrocarbon group which may have a substituent, a hydrocarbon oxy group which may have a substituent, and a hydrocarbon oxycarbonyl group which may have a substituent, m is 0 or an integer of 1 to 3, n is 0 or an integer of 1 to 6, and X is any one of a carboxylate group, a hydrogen atom, and the R1 group.