To provide an illumination device having the illumination fixture main body equipped with a lamp and an illumination cover to cover the lamp, and the illumination device capable of changing brightness from a desired position at a side face part of the illumination cover, and capable of immediately coping with the case of making the desired position such as a position directly below the illumination device brighter in the case of installation at a wall or the like.

In the illumination device 1 having the illumination fixture main body 2 equipped with the lamp 3 and the illumination cover 2 to cover the lamp 3, this is the illumination device in which the side face part 5 of the illumination cover 2 is nearly cylindrical, has light transmissivity, is a reflecting ring 7 of a nearly cylindrical shape having a notch in a part of its outer periphery, is free to be attached to and detached from the outer periphery of the side face part 5 of the illumination cover 2, and is equipped with the reflecting ring capable of rotating while sliding in contact with the outer face of the side face part 5 of the illumination cover 2 when mounted on the outer periphery of the side face part 5 of the illumination cover 2.