<p>A submerged laser beam irradiation equipment of the invention provides a high quality submerged laser beam processing of a submerged workpiece using only a small amount of a gas. The submerged laser beam irradiation equipment comprises: a focus lens for focusing a laser beam; a mirror tube which houses the lens; a first nozzle provided to cover the front end of the mirror tube in an irradiating direction of the laser beam; a skirt portion provided at the front end of said first nozzle for preventing water immersion thereinto; and a shutter means operable to open and close provided between said skirt portion and said mirror tube for preventing water immersion to said mirror tube. <IMAGE></p>
