An illumination device (100) includes a solid-state light source device (10), a pickup lens unit (20) on which light from the solid-state light source device is incident, and a polarization conversion element (40). A lens (22) constituting the light exit surface of the pickup lens unit (20) is an aspherical lens having a light exit surface shaped like a rotationally symmetric shape centered on a light axis (40ax) when viewed from a direction of the light axis (40ax), and having a cross-section of an aspherical shape when cut with a plane parallel to the light axis (40ax). The light exit surface of the aspherical lens has a function of collimating and then emitting the light having been emitted from the center of the solid-state light source device (10) in an area near to the light axis (40ax), and emitting the light so as to converge toward the light axis in an area far from the light axis (40ax).