An illumination device includes a laser element, a rotating member including a plurality of flat mirror regions that are disposed along a circumference direction of the rotating member to sequentially reflect laser beams emitted from the first laser element with rotation of the rotating member, and a wavelength conversion member. Each of the laser beams reflected at a corresponding one of the mirror regions is incident on the wavelength conversion member. When viewed in a direction in which a rotation axis of the rotating member extends, the mirror regions are disposed at mutually different angles with respect to respective ones of lines each connecting the rotation axis and the center of a respective one of the mirror regions.