An endoscope apparatus 1 includes: an insertion portion 10 to be inserted through inside of a living body, an optical fiber 14 that emits laser light from a laser light source 31, an actuator 15 that causes the distal end of the optical fiber 14 to vibrate, a ferrule 41 on which the actuator 15 is adhered and which grasps an outer circumference of the optical fiber 14, and a distal end optical system 13 that is disposed to face the optical fiber. The distal end optical system 13 has an optical characteristic in which a focal point position 43 of the laser light is in the distal end optical system 13, when the optical fiber 14 protruded from a distal end of the ferrule 41 by a predetermined length becomes shorter than the predetermined length.
