There is provided an electric actuator including: a motor that has a motor shaft, a speed reduction mechanism, an output portion that has an output shaft portion, a rotation detection device, and a first bearing. The output shaft portion extends in an axial direction and is disposed on one side in the axial direction of the motor shaft. The output portion has a first recessed portion recessed from the other side to the one side in the axial direction. An end portion of the motor shaft on the one side in the axial direction is accommodated in the first recessed portion. The first bearing is fixed to an inside surface of the first recessed portion in a radial direction. At least a portion of the rotation detection device is disposed at a position overlapping the first recessed portion in the radial direction.