Disclosed is a circular stapler. The circular stapler includes a head cover (100) formed in a tubular shape so that a space is defined therein, a cartridge (200) provided in one end of the head cover (100) to accommodate a staple therein, a staple drive (300) provided inside the head cover (100) to extrude the staple from the cartridge (200) while moving toward the cartridge (200), a sensor drive (400) provided inside the head cover (100) and configured to come into contact with the cartridge (200), and a pressure sensor (500) provided inside the head cover (200) to measure pressure applied to the cartridge (200) by receiving the pressure from the sensor drive (400).
