To provide a luminaire capable of preventing the generation of dew condensation while securing waterproofness.

This luminaire is provided with a board 1 with a light emitting diode 10 mounted thereto, and a translucent case 2 formed of glass having a rectangular parallelepiped shape elongated in the fore-and-aft direction, wherein a housing recessed part 20 for housing the board 1 is formed at the right surface. A transparent filling material 3 is filled in the housing recessed part 20, thereby the light emitting diode 10 is sealed, waterproofness is secured, and the generation of dew condensation in the housing recessed part 20 can be prevented at the same time.