An illumination light beam forming device, comprising: a first light source unit projecting a ring shaped light beam group, a second light source unit projecting light beams that form a light beam group, a combining unit disposed between the first light source unit and the second light source unit for combining the light beam group projected from the first light source unit and light beams projected from the second light source unit, condensing elements (24, 30) respectively disposed to collect light beam groups to a collecting part of a single point disposed between the first light source unit and the second light source unit, the light beam groups projected from a plurality of light sources (21, 27) of each light source unit (14, 15), wherein the combining unit includes a reflecting part formed on a plane and configured to reflect light beams collected by one of the condensing elements, and a transmitting part disposed more external than the reflecting part and configured to transmit light beams collected by the other condensing element(s), light beams projected from the second light source unit are disposed at an internal side of the light beam group projected from the first light source unit when the two light beam groups are viewed in a plane including the reflecting part, each of the condensing elements (24, 30) and the combining unit are disposed such that the collecting part of each condensing element (24, 30) coincide, and the focal point distance of the condensing element in the first light source unit is different from the focal point distance of the condensing element in the second light source unit. a first light source unit projecting a ring shaped light beam group, a second light source unit projecting light beams that form a light beam group, a combining unit disposed between the first light source unit and the second light source unit for combining the light beam group projected from the first light source unit and light beams projected from the second light source unit, condensing elements (24, 30) respectively disposed to collect light beam groups to a collecting part of a single point disposed between the first light source unit and the second light source unit, the light beam groups projected from a plurality of light sources (21, 27) of each light source unit (14, 15), wherein the combining unit includes a reflecting part formed on a plane and configured to reflect light beams collected by one of the condensing elements, and a transmitting part disposed more external than the reflecting part and configured to transmit light beams collected by the other condensing element(s), light beams projected from the second light source unit are disposed at an internal side of the light beam group projected from the first light source unit when the two light beam groups are viewed in a plane including the reflecting part, each of the condensing elements (24, 30) and the combining unit are disposed such that the collecting part of each condensing element (24, 30) coincide, and the focal point distance of the condensing element in the first light source unit is different from the focal point distance of the condensing element in the second light source unit.