An ultraviolet irradiation device includes: a light source unit that includes at least one ultraviolet LED； a driver that supplies a drive current to the ultraviolet LED； and a controller that controls an operation of the driver. The controller calculates a drive current value of the ultraviolet LED based on information indicating spectral intensity characteristics of the ultraviolet LED and information indicating spectral action characteristics of a target of irradiation irradiated by light from the light source unit, and the driver supplies a drive current of a value calculated by the controller to the ultraviolet LED.
