Abstract: An illumination light source which attaches to a lighting fixture by being rotated in a predetermined rotational direction R, the illumination light source including: a light-emitting unit (LED module), a case which includes a first opening and houses the light-emitting unit; and a translucent cover provided over the first opening, wherein the translucent cover includes a plurality of projecting portions provided at predetermined intervals in the rotational direction R, and the plurality of projecting portions each include a plurality of projections provided at a predetermined distance from each other in the rotational direction R and including a flat surface facing a direction opposite the rotational direction R.

Abstract: A lighting apparatus includes an apparatus body, an LED unit including an LED substrate, and a fixing member which attaches the LED substrate to a bottom surface of the apparatus body. The fixing member has elasticity and includes: a fixing claw having a flat plate, which protrudes in a planar direction and which presses the LED substrate against the bottom surface of the apparatus body; and a positioning claw having an L-shape, which protrudes in the planar direction and which contacts at least one side of the LED substrate in the planar direction.