An additive-manufacturing head for performing additive manufacturing by feeding a material powder to a workpiece and irradiating the workpiece with a laser beam, the additive-manufacturing head comprising: an optical element configured to form a laser beam in a ring shape; a laser beam emitting unit configured to emit the ring-shaped laser beam toward the workpiece; and a material feeding unit having an outlet which is disposed inside the ring-shaped laser beam emitted from the laser beam emitting unit and from which the material powder is released, and configured to feed the material powder from the outlet toward the workpiece, the material feeding unit having a pipe shape capable of delivering the material powder, the laser beam emitting unit including condenser lenses (51, 54) and a protective lens configured to concentrate the ring-shaped laser beam emitted toward the workpiece, and the material feeding unit penetrating a through hole formed in the condenser lenses (51, 54), wherein the additive-manufacturing head being characterized in that the material feeding unit includes a plurality of tube members (66, 67, 68) configured to feed respective different types of material powder, wherein the plurality of tube members (66, 67, 68) is enclosed in an outer tube, wherein a cover body forming a space which houses the laser beam emitting unit, wherein an opening is formed in the cover body which is located to face a surface of the workpiece during the additive manufacturing, wherein the material feeding unit protrudes from the space in the cover body to an external space through the opening, and the outlet is located in the external space. an optical element configured to form a laser beam in a ring shape; a laser beam emitting unit configured to emit the ring-shaped laser beam toward the workpiece; and a material feeding unit having an outlet which is disposed inside the ring-shaped laser beam emitted from the laser beam emitting unit and from which the material powder is released, and configured to feed the material powder from the outlet toward the workpiece, the material feeding unit having a pipe shape capable of delivering the material powder, the laser beam emitting unit including condenser lenses (51, 54) and a protective lens configured to concentrate the ring-shaped laser beam emitted toward the workpiece, and the material feeding unit penetrating a through hole formed in the condenser lenses (51, 54), wherein the additive-manufacturing head being characterized in that the material feeding unit includes a plurality of tube members (66, 67, 68) configured to feed respective different types of material powder, wherein the plurality of tube members (66, 67, 68) is enclosed in an outer tube, wherein a cover body forming a space which houses the laser beam emitting unit, wherein an opening is formed in the cover body which is located to face a surface of the workpiece during the additive manufacturing, wherein the material feeding unit protrudes from the space in the cover body to an external space through the opening, and the outlet is located in the external space. a cover body forming a space which houses the laser beam emitting unit, wherein an opening is formed in the cover body which is located to face a surface of the workpiece during the additive manufacturing, wherein the material feeding unit protrudes from the space in the cover body to an external space through the opening, and the outlet is located in the external space.