A laser light source device (10; 11) comprising: a laser light source that emits linearly polarized laser beams from a plurality of light emitting points, wherein the plurality of emitting points are within a plane (xy plane) that is an emission side of laser beams, and the laser beams are perpendicular to the emission side of laser beams; and a polarization rotating unit that is arranged on a light axis of a laser beam output from a plurality of light emitting points of the laser light source, a light collection unit consisting of one or a plurality of collecting lenses that collects a first half of the entire laser beam transmitted from the laser light source via the polarization rotating unit and a second half of the entire laser beam transmitted from the laser light source without passing through the polarization rotating unit; and a light propagating unit which is an optical fibre or an integrator rod and to which the laser beams collected by the light collecting unit are input and which causes the laser beams to propagate therethrough, wherein the polarization rotating unit rotates a polarization of the laser beam output from a plurality of light emitting points by 90°, the light propagating unit is arranged such that a light collecting position of the first half laser beam and the second half laser beam collected by the light collecting unit is an entrance of the light propagating unit,the first half laser beam is input to the light propagating unit from a one-side direction of an axis of the light propagating unit and the second half laser beam is input in axial symmetry with the first laser beam relative to the axis of the light propagating unit, the first half laser beam is emitted from the light propagating unit by having an angle distribution that is rotationally symmetrical with the axis of the light propagating unit and the second half laser beam is emitted from the light propagating unit by having an angle distribution that is rotationally symmetrical with the axis of the light propagating unit, and the first half laser beam is emitted from the light propagating unit in superimposition with the second half laser beam. a laser light source that emits linearly polarized laser beams from a plurality of light emitting points, wherein the plurality of emitting points are within a plane (xy plane) that is an emission side of laser beams, and the laser beams are perpendicular to the emission side of laser beams; and a polarization rotating unit that is arranged on a light axis of a laser beam output from a plurality of light emitting points of the laser light source, a light collection unit consisting of one or a plurality of collecting lenses that collects a first half of the entire laser beam transmitted from the laser light source via the polarization rotating unit and a second half of the entire laser beam transmitted from the laser light source without passing through the polarization rotating unit; and a light propagating unit which is an optical fibre or an integrator rod and to which the laser beams collected by the light collecting unit are input and which causes the laser beams to propagate therethrough, wherein the polarization rotating unit rotates a polarization of the laser beam output from a plurality of light emitting points by 90°, the light propagating unit is arranged such that a light collecting position of the first half laser beam and the second half laser beam collected by the light collecting unit is an entrance of the light propagating unit,the first half laser beam is input to the light propagating unit from a one-side direction of an axis of the light propagating unit and the second half laser beam is input in axial symmetry with the first laser beam relative to the axis of the light propagating unit, the first half laser beam is emitted from the light propagating unit by having an angle distribution that is rotationally symmetrical with the axis of the light propagating unit and the second half laser beam is emitted from the light propagating unit by having an angle distribution that is rotationally symmetrical with the axis of the light propagating unit, and the first half laser beam is emitted from the light propagating unit in superimposition with the second half laser beam.