A printer that performs printing on a medium by an inkjet scheme includes an inkjet head, for ejecting droplets of an ink containing a solvent to be evaporated to fix the ink on the medium; and an ultraviolet light source that irradiates the ink with an ultraviolet light. The ink contains a colorant, the solvent, an exothermic polymerizable substance, and a polymerization initiator. The colorant develops a color of the ink. The exothermic polymerizable substance causes a polymerization reaction to generate heat. The polymerization initiator starts the polymerization reaction of the exothermic polymerizable substance in response to irradiation with ultraviolet light. The ultraviolet light source irradiates the ink adhered to the medium with ultraviolet light to make the exothermic polymerizable substance cause the polymerization reaction. Thus, the solvent in the ink is evaporated by the heat generated by the polymerization reaction to fix the ink on the medium.