Irradiation apparatus and a droplet ejection apparatus

Disclosed is compared with the case where the transmitting member is disposed in the gap between the medium and the irradiating unit does not move relative to the irradiation unit, the amount of deposit adhering to the portion disposed in the gap in transmission member and an object thereof is to provide a small irradiation device. An irradiation apparatus, than the discharge portion in the moving direction of the medium to be moved relative discharge unit for discharging droplets arranged with a gap on the medium on the downstream side, the discharged to the discharge portion an irradiation unit for irradiating light to the liquid droplet landed on the medium, with the strip, light is transmitted, and a, a transmission member for moving the gap relative to the irradiation unit. .FIELD 1