Provided is an illumination appliance (1) that illuminates in a direction opposite a direction towards a mounting face (C) thereof, with radiation light of light sources (5) installed on a main-body housing (2) mounted on the mounting face (C), wherein the illumination appliance (1) is equipped with a light-guiding plate (11) that surrounds the outer circumference of the main-body housing (2) and protrudes out in the diameter direction thereof, has a light incident face (11a), and guides light in the diameter direction. Light radiated from the light sources (5) enters the light-guiding plate (11) from the light incident face (11a) thereof, and light radiated from the light-guiding plate (11) illuminates the mounting face (C).