A lighting device according to an embodiment includes a socket unit, a light emitting unit, and a lid unit. The light emitting unit is provided in an accommodation unit of the socket unit, and includes a light emitting element. The lid unit closes the accommodation unit of the socket unit, and is formed with an opening portion which causes light radiated from the light emitting element to pass through. An end face of the light emitting unit on the opening portion side overlaps with the opening portion in the thickness direction of the lid unit, and is located on the light emitting unit side rather than an end face of the lid unit on a side opposite to the light emitting unit side.