A Nd:YAG laser at a wavelength of 1444 nm for removing fatty tissue is disclosed, which can directly irradiate laser light onto subcutaneous fat and efficiently remove fatty tissue with an adverse reaction on surrounding tissue minimized by using laser light at an oscillating wavelength of 1444 nm which has both a high fat absorptivity and a high water absorptivity among wavelengths that can be oscillated by the Nd:YAG laser. The Nd:YAG laser includes a flash lamp, a Nd:YAG rod, a high reflection mirror, an output coupler, a convergent lens for converging the laser light beam oscillating through the output coupler, an optical fiber for guiding the converged laser beam, and a guide needle for guiding the laser beam from the guide fiber to subcutaneous fat. Both end surfaces of the Nd:YAG rod, an inner surface of the high reflection mirror, and inner and outer surfaces of the output coupler are coated so as to oscillate only the laser beam at the wavelength of 1444 nm through the output coupler.
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