A printing device includes a head, an irradiation unit and a controller. The head is configured and arranged to eject a liquid onto a medium. The irradiation unit is configured and arranged to radiate active rays for curing the liquid on the medium. The irradiation unit is relatively movable with respect to the medium. The controller is configured to decrease radiation of the active rays of the irradiation unit when a time in which the irradiation unit relatively passes over an entire length of the medium has elapsed since start of lighting of the irradiation unit.