An electric actuator includes a motor with a motor shaft extending along a central axis, a speed reducer connected to the motor shaft, an output portion including an output shaft portion, a rotation detector to detect rotation of the output portion, a case, a first bearing to connect the motor shaft to the output portion to be rotatable with respect to each other, and a second bearing to rotatably support the output portion with respect to the case. A support tubular portion into which the second bearing is fitted is provided at a portion of an inner surface of the case on one side in the axial direction for the speed reducer. The first bearing, the output portion, the second bearing and the support tubular portion overlap each other when seen in a radial direction. At least a portion of the rotation detector faces an outward side of the support tubular portion in the radial direction.