Abstract: A laser light transmitting probe having at least one flat surface, which transmits laser light to living tissue to permit an incision, vaporization, an exfoliation and hemostasis. According to a preferred embodiment, a base portion of the probe is provided with a cylindrical part, a conical part and two flat surfaces formed on the both sides of the conical part. A surface layer, which contains laser light absorbing particles, laser light scattering particles having a larger refractive index than that of the material of the probe and a binder made from a laser light transmissible material, is formed on the flat surface for effective laser light irradiation. Due to the structure of a flat part provided with the flat surfaces, various types of surgical treatments can be performed for various types of treated target are of tissue with only this probe.