Provided is an electric actuator (1), including: a motor (10); a motor case (11) configured to accommodates the motor (10); and a motion conversion mechanism (22) configured to convert a rotary motion generated through drive by the motor (10) into a linear motion in a direction parallel to an output shaft (10a) of the motor (10). The motion conversion mechanism (22) includes a movable part (22, which is arranged in parallel with the output shaft (10a) and is configured to perform the linear motion. The movable part (22) and the motor (10) overlap one another in a radial direction of the motor (10). A sensor target (73) is arranged in the moveable part 22, and a non-contact sensor (70) configured to detect a position of the sensor target (73) in a linear motion direction in a non-contact manner is arranged in the motor case (11).