ELEMENT DEVICE AND VISUAL RECOGNITION DEVICE

In an illumination device, heat generated by a light emitting element is transmitted to a flexible circuit board, a first reinforcement plate, a heat dissipation seal, and a coupling portion of a housing box upper wall, and discharged upward from the coupling portion. A projection portion of a case projects further upward than the coupling portion, and a male connector housed in the projection portion is disposed at a position not opposing an upper surface of the coupling portion. This means that the male connector and the projection portion can be suppressed from impeding a convection current of heat discharged upward from the coupling portion, enabling good discharge of heat generated by the light emitting element upward from the coupling portion.