Patent ID: 8591401

Claim:
An endoscope apparatus comprising: an image processing portion for performing image processing on a signal of an image picked up by an image pickup device installed in a distal end portion of an endoscope insertion portion and generating an endoscope image; a graphics generating portion for generating a gravity direction graphic to be displayed with the endoscope image in which when the distal end portion is in a normal position, a gravity direction mark indicating a gravity direction and a zenith direction mark indicating a direction opposite to the gravity direction are placed at positions opposing each other on a circumference of the gravity direction graphic; a control portion for, according to the position of the distal end portion, controlling the graphics generating portion to generate the gravity direction graphic; an image combining portion for combining the gravity direction graphic in a predetermined position of the endoscope image; a distal end optical system that is detachably attached to the distal end portion, the distal end optical system comprising an identification portion; and an optical system identification portion for identifying a class of the distal end optical system based on the identification portion, wherein the control portion causes, when the position of the distal end portion is changed, the gravity direction mark or the zenith direction mark to be moved, according to an amount of the change, to a predetermined position inside the circumference of the gravity direction graphic and to be displayed, and corrects a coordinate system of the gravity direction mark and the zenith direction mark based on the class of the distal end optical system identified by the optical system identification portion, and makes an instruction to generate the gravity direction graphic in which the gravity direction mark and the zenith direction mark of the corrected coordinate system are placed.