A stepping motor-driven control valve comprising: a body including a lead-in port through which a refrigerant is introduced from the upstream side, a lead-out port through which the refrigerant is delivered to the downstream side, and a valve hole that connects the lead-in port with the lead-out port; a valve element for opening/closing a valve portion by moving toward and away from the valve hole; a stepping motor including a rotor for driving the valve element in a direction to open/close the valve portion; a shaft that is fixed to the body and extended in an axial direction of the rotor, a helical guide portion that runs on an outer periphery of the shaft along an axial direction thereof; a rotation stopper including an engagement portion that engages along the guide portion and a power transmission portion supported by the rotor, the rotation stopper being configured to be displaced in the axial direction of the shaft with a rotation of the rotor, and to limit the rotation of the rotor by the power transmission portion being stopped at both ends of the shaft; and a valve operating element that is engaged with the rotor and translationally supported in the axial direction as well as screwed into the body, and moves in the open/close direction of the valve portion integrally with the valve element by the rotation of the rotor, wherein the rotor is hollow-shaped and has bearing portions at both ends thereof, and by the shaft running into an internal space of the rotor, the rotation stopper is configured to be displaced within the internal space, characterised in that the valve operating element is provided with legs that are fitted into guide portions of the rotor, and in that the valve operating element is arranged such that displacement of the valve operating element relative to the rotor in rotational direction is limited, but displacement of the valve operating element in axial direction along the guide portions of the rotor is allowed. a body including a lead-in port through which a refrigerant is introduced from the upstream side, a lead-out port through which the refrigerant is delivered to the downstream side, and a valve hole that connects the lead-in port with the lead-out port; a valve element for opening/closing a valve portion by moving toward and away from the valve hole; a stepping motor including a rotor for driving the valve element in a direction to open/close the valve portion; a shaft that is fixed to the body and extended in an axial direction of the rotor, a helical guide portion that runs on an outer periphery of the shaft along an axial direction thereof; a rotation stopper including an engagement portion that engages along the guide portion and a power transmission portion supported by the rotor, the rotation stopper being configured to be displaced in the axial direction of the shaft with a rotation of the rotor, and to limit the rotation of the rotor by the power transmission portion being stopped at both ends of the shaft; and a valve operating element that is engaged with the rotor and translationally supported in the axial direction as well as screwed into the body, and moves in the open/close direction of the valve portion integrally with the valve element by the rotation of the rotor, wherein the rotor is hollow-shaped and has bearing portions at both ends thereof, and by the shaft running into an internal space of the rotor, the rotation stopper is configured to be displaced within the internal space, characterised in that the valve operating element is provided with legs that are fitted into guide portions of the rotor, and in that the valve operating element is arranged such that displacement of the valve operating element relative to the rotor in rotational direction is limited, but displacement of the valve operating element in axial direction along the guide portions of the rotor is allowed.