<p>An electric cylinder includes: an outer cylinder including, on one end side, a fixing section for fixing the electric cylinder to an attachment place of the electric cylinder; a rod configured to be capable of extending and retracting in an axis direction from an opening on the one end side of the outer cylinder; a bearing provided on the other end side and on the inside of the outer cylinder; a rotating shaft rotatably supported by the bearing and driven to rotate with driving force of a motor; a screw mechanism that converts a rotary motion of the rotating shaft into a linear motion of the rod and transmits the linear motion; and a strain detecting section provided in a position on the outer circumference of the outer cylinder and between a position where the bearing is provided and the fixing section.</p>
