An illumination device that can reduce variations in brightness is provided. This illumination device (10) includes a light source module (5) and a chassis (1) provided with an accommodation space (10a). A light guide plate placement portion (1a) and a light source placement portion (1b) are provided in the accommodation space (10a). The light source placement portion (1b) has a placement surface (1c), the placement surface (1c) is formed such that the placement surface (1c) is raised with respect to the light source placement portion (1b) and the light source module (5) is placed on the placement surface (1c).