PROBLEM TO BE SOLVED: To provide a lighting device which is less likely to cause leaked light and achieves high lighting efficiency.SOLUTION: A lighting device includes: a case body 3; a division wall 3b which divides an inner space of the case body 3 into a light source chamber 3c and an electric chamber 3a; a translucent plate which seals a lower surface of the light source chamber 3c in an airtight manner; and an upper lid 4 which closes the electric chamber 3a so as to open and close the electric chamber 3a.
