The present invention is aimed at providing an endoscope apparatus having a good operability. An endoscope apparatus includes an accessory 36, 50 including an actuation portion configured to be actuated, an operating means 48； 62； 80 for operating the actuation portion, an endoscope 10 including an accessory insertion pass wherein the accessory 36, 50 is adapted to be inserted through the accessory insertion pass from a proximal end portion of the accessory insertion pass to a distal end portion of the accessory insertion pass, and projected from and retracted into the distal end portion of the accessory insertion pass, a detecting means 82, 83； 84, 85 configured to detect a condition of a part of the accessory 36, 50, which is projected from the distal end portion of the accessory insertion pass, and a control means 49； 61； 79 configured to control an actuation of the actuation portion by an operation to the operating means 48； 62； 80, on the basis of a result of detection by the detecting means 82, 83； 84, 85.
