A laser welding head including a base unit thereof comprising: a shield gas injection nozzle that is provided to the base unit , irradiates laser light onto a target, and supplies a shielding gas to the target ; and a welding wire supply nozzle that is provided to the base unit and supplies a welding wire to the target, and the laser welding head further comprises a shielding gas cover which forms an air space by locally surrounding the target and wherein the laser welding head is configured for use in water, characterised in that each of the shield gas injection nozzle and the welding wire supply nozzle includes a main body section and a surface layer section that covers the entirety of an outer periphery of the main body section , and the surface layer section in the air space is entirely formed by at least one material selected from: alloy composed of at least one metal carbide where the metal is selected from transition metals of the IV, V, VI group of the periodic table; cermet; ceramics; and MCrAlY alloy and, further comprising a heat dissipation section including a first metal member attached on an inner peripheral surface of the shield gas injection nozzle , the first metal member having higher thermal conductivity than that of the shield gas injection nozzle , a second metal member attached on an inner peripheral surface of the welding wire supply nozzle , the second metal member has higher thermal conductivity than that of the welding wire supply nozzle , and a third metal member attached on the upper end surface of the base unit , the third metal member being connected with the first and second metal members . a shield gas injection nozzle that is provided to the base unit , irradiates laser light onto a target, and supplies a shielding gas to the target ; and a welding wire supply nozzle that is provided to the base unit and supplies a welding wire to the target, and the laser welding head further comprises a shielding gas cover which forms an air space by locally surrounding the target and wherein the laser welding head is configured for use in water, characterised in that each of the shield gas injection nozzle and the welding wire supply nozzle includes a main body section and a surface layer section that covers the entirety of an outer periphery of the main body section , and the surface layer section in the air space is entirely formed by at least one material selected from: alloy composed of at least one metal carbide where the metal is selected from transition metals of the IV, V, VI group of the periodic table; cermet; ceramics; and MCrAlY alloy and, further comprising a heat dissipation section including a first metal member attached on an inner peripheral surface of the shield gas injection nozzle , the first metal member having higher thermal conductivity than that of the shield gas injection nozzle , a second metal member attached on an inner peripheral surface of the welding wire supply nozzle , the second metal member has higher thermal conductivity than that of the welding wire supply nozzle , and a third metal member attached on the upper end surface of the base unit , the third metal member being connected with the first and second metal members . <EOS>