ENDOSCOPE SYSTEM

An endoscope system includes an endoscope that can be inserted in and pulled out from a subject, and includes a tip portion provided with an imaging unit including an optical system and an image sensor, a posture control sensor that is arranged at the tip portion of the endoscope, and detects posture information in at least three directions, a front-rear direction, an up-down direction, and a left-right direction, of the tip portion, and a calculation device that calculates presence or absence of deviation in the up-down direction of an image captured by the imaging unit, based on the posture information in the three directions detected by the posture control sensor. The calculation device displays an indicator indicating the presence or absence of deviation in the up-down direction of the image in association with the image on a monitor.