A projector includes a light source unit group having light source units arranged in matrix, a mirror group arranged in a traveling direction of light beams emitted from the unit group, the mirror group including reflective mirrors that reflect, with reflective parts, the beams emitted from the unit group while each of the reflective mirrors narrows interval between the beams in a first direction, the mirrors being arranged stepwise so as to narrow interval between the beams in a second direction, and a cylindrical lens arranged in traveling directions of beams reflected by the mirrors, the lens causing the reflected beams reflected by the mirrors and traveling in the traveling directions different from each other to be parallel, the reflective parts being arranged to be bent in steps in the second direction so that the beams to be reflected in the second direction are close to each other.