An endoscope apparatus comprises an elongate insert section including an observation window in the distal end portion and inserted into an object to be observed; an observation device for producing an endoscope image, the observation device including a focusing optical system which receives an incident light from the object through the observation window to focus the endoscope image; and a vibration device for vibrating at least a part of the insert section in a direction crossing the axial direction of the insert section, the vibration device including a vibration unit capable of vibrating in itself to vibrate at least the part of the insert section even under a condition that the insert section is not contact with the object.
