An inkjet printer comprising: a guide rail that opposes a medium support member that supports a printing medium, that is movable in a moving direction relative to the printing medium supported by the medium support member, and that extends in a scanning direction that is orthogonal to the moving direction; a head unit including a carriage that can reciprocate in the scanning direction along the guide rail, a printer head that is mounted on the carriage and configured to discharge an ink toward the printing medium, and an ultraviolet radiation unit (23L, 23R) that is mounted on the carriage and configured to output an ultraviolet radiation toward the printing medium thereby curing the ink that has adhered onto the printing medium after being discharged from the printer head; and an intensity controlling unit configured to control an intensity of the ultraviolet radiation output from the ultraviolet radiation unit, wherein the ultraviolet radiation unit is arranged in the carriage and includes a first ultraviolet radiation unit (23L or 23R) that is arranged on a first side of the printer head in the scanning direction and a second ultraviolet radiation unit (23R or 23L) that is arranged on a second side of the printer head in the scanning direction, the inkjet printer characterized in that the intensity controlling units are configured to independently control the intensities of the ultraviolet radiations output from the second ultraviolet radiation unit to be different from the intensities of the ultraviolet radiations output of the first ultraviolet radiation unit, depending on a direction of movement of the carriage; with the proviso that the intensities of the ultraviolet radiation output from the first ultraviolet radiation unit and the second ultraviolet radiation unit are not zero. a guide rail that opposes a medium support member that supports a printing medium, that is movable in a moving direction relative to the printing medium supported by the medium support member, and that extends in a scanning direction that is orthogonal to the moving direction; a head unit including a carriage that can reciprocate in the scanning direction along the guide rail, a printer head that is mounted on the carriage and configured to discharge an ink toward the printing medium, and an ultraviolet radiation unit (23L, 23R) that is mounted on the carriage and configured to output an ultraviolet radiation toward the printing medium thereby curing the ink that has adhered onto the printing medium after being discharged from the printer head; and a carriage that can reciprocate in the scanning direction along the guide rail, a printer head that is mounted on the carriage and configured to discharge an ink toward the printing medium, and an ultraviolet radiation unit (23L, 23R) that is mounted on the carriage and configured to output an ultraviolet radiation toward the printing medium thereby curing the ink that has adhered onto the printing medium after being discharged from the printer head; and an intensity controlling unit configured to control an intensity of the ultraviolet radiation output from the ultraviolet radiation unit, wherein the ultraviolet radiation unit is arranged in the carriage and includes a first ultraviolet radiation unit (23L or 23R) that is arranged on a first side of the printer head in the scanning direction and a second ultraviolet radiation unit (23R or 23L) that is arranged on a second side of the printer head in the scanning direction, the inkjet printer characterized in that the intensity controlling units are configured to independently control the intensities of the ultraviolet radiations output from the second ultraviolet radiation unit to be different from the intensities of the ultraviolet radiations output of the first ultraviolet radiation unit, depending on a direction of movement of the carriage; with the proviso that the intensities of the ultraviolet radiation output from the first ultraviolet radiation unit and the second ultraviolet radiation unit are not zero.