An electric actuator, comprising: a motor part configured to drive upon receiving supply of power; and a motion conversion mechanism part configured to convert a rotary motion of the motor part into a linear motion to output the motion, wherein the motion conversion mechanism part comprises: a ball screw shaft arranged coaxially with a rotation center of the motor part; and a ball screw nut, which is rotatably fitted to an outer periphery of the ball screw shaft through intermediation of a plurality of balls, and is provided so as to be capable of transmitting torque with a rotor of the motor part rotatably supported through intermediation of a rolling bearing (27, 30), wherein the ball screw shaft advances toward one side in the axial direction or retreats toward another side in the axial direction in accordance with a rotation direction of the ball screw nut, wherein a thrust bearing is arranged adjacent to the ball screw nut on the another side in the axial direction, so that it directly supports a thrust load acting on the ball screw nut along with the advance of the ball screw shaft, wherein the rolling bearing (27, 30) comprises two rolling bearings (27, 30) arranged at two locations apart from each other in the axial direction, wherein the thrust bearing is arranged within a range in the axial direction between the two rolling bearings (27, 30), wherein one rolling bearing of the two rolling bearings (27, 30) supports one end portion in the axial direction of the rotor, and is arranged close to an end portion of a rotor core forms the rotor on the one side in the axial direction, and wherein another rolling bearing of the two rolling bearings (27, 30) supports another end portion in the axial direction of the rotor, and is arranged close to an end portion of the rotor core on the another side in the axial direction. a motor part configured to drive upon receiving supply of power; and a motion conversion mechanism part configured to convert a rotary motion of the motor part into a linear motion to output the motion, wherein the motion conversion mechanism part comprises: a ball screw shaft arranged coaxially with a rotation center of the motor part; and a ball screw nut, which is rotatably fitted to an outer periphery of the ball screw shaft through intermediation of a plurality of balls, and is provided so as to be capable of transmitting torque with a rotor of the motor part rotatably supported through intermediation of a rolling bearing (27, 30), a ball screw shaft arranged coaxially with a rotation center of the motor part; and a ball screw nut, which is rotatably fitted to an outer periphery of the ball screw shaft through intermediation of a plurality of balls, and is provided so as to be capable of transmitting torque with a rotor of the motor part rotatably supported through intermediation of a rolling bearing (27, 30), wherein the ball screw shaft advances toward one side in the axial direction or retreats toward another side in the axial direction in accordance with a rotation direction of the ball screw nut, wherein a thrust bearing is arranged adjacent to the ball screw nut on the another side in the axial direction, so that it directly supports a thrust load acting on the ball screw nut along with the advance of the ball screw shaft, wherein the rolling bearing (27, 30) comprises two rolling bearings (27, 30) arranged at two locations apart from each other in the axial direction, wherein the thrust bearing is arranged within a range in the axial direction between the two rolling bearings (27, 30), wherein one rolling bearing of the two rolling bearings (27, 30) supports one end portion in the axial direction of the rotor, and is arranged close to an end portion of a rotor core forms the rotor on the one side in the axial direction, and wherein another rolling bearing of the two rolling bearings (27, 30) supports another end portion in the axial direction of the rotor, and is arranged close to an end portion of the rotor core on the another side in the axial direction.