A substrate (71) supports a light source (72) and a control circuit (73). The control circuit (73) is configured so as to be able to control the turning on and off of the light source (72). The substrate (71) is supported by a conductive housing (2). The housing (2) is configured so as to be coupled with a translucent cover through which light emitted from the light source passes. The housing (2) includes a through hole. A connector unit includes a connecting part and a terminal holding part. The connecting part is disposed on the outside of the housing (2). At least part of the terminal holding part which has an insulating property is disposed inside the through hole. The terminal holding part holds a conductive terminal (82c). The conductive terminal (82c) is coupled with the substrate (71) and is electrically connected to the control circuit (73).