Patent ID: 8474339

Claim:
An electric actuator comprising: a cylinder body which stores therein a fluid; a screw shaft which is provided in the cylinder body, and is rotated by an electric motor; a piston rod which moves linearly in accordance with rotation of the screw shaft; a first port formed on an inner face of a rod-side cylinder chamber of the cylinder body, which cylinder chamber is located in a direction in which the piston rod advances; a second port formed on an inner face of a head-side cylinder chamber of the cylinder body, which cylinder chamber is located in a direction in which the piston rod retracts; a cylinder chamber connecting passage connecting the first port and the second port, wherein the piston part of the piston rod closes the first port when the piston rod advances; a nut into which the screw shaft is screwed; and an elastic member provided between the nut and the piston part.