PURPOSE:To improve the curing effect by preventing the accumulation of the water in a cavity formed by the irradiation of the erbium YAG laser beam, supressing the acceleration of deterioration of the tip of a probe, and preventing the attachment of residue and the carbonization by the transpiration of water. CONSTITUTION:In a laser medical treatment device 11 provided with an erbium YAG laser beam source, a hand piece 1 to direct the laser beam to a diseased part, and a fiber for beam leading to lead the laser beam injected from the laser beam source to the hand piece 1, a means to feed a mixture fluid of a gas and a liquid to the diseased part where the laser beam is irradiated, in the atmized condition, is equipped.
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