A printing apparatus for printing on a medium with an ultraviolet curing ink of N different colors, where N is an integer of 2 or greater, in an inkjet mode, comprising: a first-color head that is an inkjet head (202y, 202m, 202c, 202k) configured to eject first-color ink drops which are ink drops of the ultraviolet curing ink of a first color of the N colors; a second-color head which is an inkjet head (202y, 202m, 202c, 202k) configured to eject second-color ink drops which are ink drops of the ultraviolet curing ink of a second color which is one of the N colors and is different from the first color; a main scan driver configured to drive the first-color head and the second-color head to perform main scan operations of ejecting ink drops while moving in a predetermined main scan direction; a sub scan driver configured to relatively move the first-color head and the second-color head with respect to the medium in a sub scan direction perpendicular to the main scan direction, wherein the first color head and the second-color head are installed side by side in the sub scan direction such that their positions in the sub scan direction deviate and do not overlap each other, wherein the first-color head is configured to eject the first-color ink drops in one of the main scan operations which is determined according to the position on the medium, the second-color head is configured to, after the first-color head has ejected the first-color ink drops, ejects the second-color ink drops in another main scan operation, characterized in that a temporarily hardening light source (204, 208) configured to radiate an ultraviolet light which hardens the ultraviolet curing ink on the medium to a temporarily hardened state which is a state where at least a surface of the ultraviolet curing ink has viscosity; and a fully hardening light source configured to radiate the ultraviolet light which completes hardening of the ultraviolet curing ink on the medium, wherein the temporarily hardening light source (204, 208) is installed between the first-color head and the second-color head in the sub scan direction (x), the temporarily hardening light source (204, 208) is configured to harden the ultraviolet curing ink of the first color on the medium, to the temporarily hardened state, after the first-color head has ejected the first-color ink drops and before the second-color head ejects the second-color ink drops, the second-color head is configured to eject the second-color ink drops onto an area where the ultraviolet curing ink of the first color has hardened to the temporarily hardened state, and the fully hardening light source is configured to radiate the ultraviolet light after the second-color ink drops are ejected. a first-color head that is an inkjet head (202y, 202m, 202c, 202k) configured to eject first-color ink drops which are ink drops of the ultraviolet curing ink of a first color of the N colors; a second-color head which is an inkjet head (202y, 202m, 202c, 202k) configured to eject second-color ink drops which are ink drops of the ultraviolet curing ink of a second color which is one of the N colors and is different from the first color; a main scan driver configured to drive the first-color head and the second-color head to perform main scan operations of ejecting ink drops while moving in a predetermined main scan direction; a sub scan driver configured to relatively move the first-color head and the second-color head with respect to the medium in a sub scan direction perpendicular to the main scan direction, wherein the first color head and the second-color head are installed side by side in the sub scan direction such that their positions in the sub scan direction deviate and do not overlap each other, wherein the first-color head is configured to eject the first-color ink drops in one of the main scan operations which is determined according to the position on the medium, the second-color head is configured to, after the first-color head has ejected the first-color ink drops, ejects the second-color ink drops in another main scan operation, characterized in that a temporarily hardening light source (204, 208) configured to radiate an ultraviolet light which hardens the ultraviolet curing ink on the medium to a temporarily hardened state which is a state where at least a surface of the ultraviolet curing ink has viscosity; and a fully hardening light source configured to radiate the ultraviolet light which completes hardening of the ultraviolet curing ink on the medium, wherein the temporarily hardening light source (204, 208) is installed between the first-color head and the second-color head in the sub scan direction (x), the temporarily hardening light source (204, 208) is configured to harden the ultraviolet curing ink of the first color on the medium, to the temporarily hardened state, after the first-color head has ejected the first-color ink drops and before the second-color head ejects the second-color ink drops, the second-color head is configured to eject the second-color ink drops onto an area where the ultraviolet curing ink of the first color has hardened to the temporarily hardened state, and the fully hardening light source is configured to radiate the ultraviolet light after the second-color ink drops are ejected.