Electric actuator

An electric actuator, comprising:

• a driving unit comprising an electric motor;
• and
• a motion conversion mechanism unit, which is configured to convert a rotary motion of the driving unit into a linear motion, and is arranged in series to the driving unit, the motion conversion mechanism unit comprising:
• a nut configured to receive the rotary motion of the driving unit to be rotated;
• and
• a threaded shaft, which is disposed inside an inner periphery of the nut and is configured to perform a linear motion along with the rotation of the nut,
• wherein an inner member and an outer member, which are coupled to each other so that a rotational torque of the driving unit is transmittable therebetween, are provided in a torque transmission path between the driving unit and the motion conversion mechanism unit, and the inner member is clearance-fitted into an inner periphery of the outer member.