A back door handle device is provided above a license plate of a back door of a vehicle and serves as both a license lamp and a handle switch. The back door handle device includes a light emitting element, a switch that outputs a signal for unlocking or locking the back door, a housing that houses the light emitting element and the switch, and an outer cover that covers the housing and includes an integrally molded article. The integrally molded article includes a transparent portion formed of a material that transmits light emitted from the light emitting element, and an elastic portion covering an outer side of the transparent portion. The transparent portion includes a lens portion that extracts light emitted from the light emitting element. The elastic portion includes a switch cover portion that is applied with a pushing force from an outside for outputting the signal.