An electric valve comprising: - a motor including a rotor member and a stator member for applying a rotational force to the rotor member; - a power transmission mechanism for converting rotational movement of the rotor member into axial movement of a valve body; - a housing for accommodating the motor and the power transmission mechanism; and - a base member connected to the housing and provided with a valve seat to which the valve body is separated or seated, wherein the housing includes: - a tube-shaped member provided with a connector portion configured to be connected to an external power source; and - a cover member for shielding the tube-shaped member; - a heat generation portion formed of a first material; - a heat receiving portion formed of a second material and bonded to the heat generation portion; wherein the heat generating portion is a part of the tube-shaped member; wherein the heat receiving portion is part of the cover member; wherein said motor is disposed on the tube-shaped member; wherein an angle sensor for detecting the rotation angle of the rotor member is disposed on the cover member; and wherein the cover member comprises: - an insertion portion that fits inside an end portion of the tube-shaped member; and - ribs formed on an outer peripheral surface of the insertion portion; wherein a laser light transmittance in said first material is lower than a laser light transmittance in said second material, and the heat generation portion is welded to the heat receiving portion by irradiating the heat generation portion with a laser beam that has passed through the heat receiving portion. - a motor including a rotor member and a stator member for applying a rotational force to the rotor member; - a power transmission mechanism for converting rotational movement of the rotor member into axial movement of a valve body; - a housing for accommodating the motor and the power transmission mechanism; and - a base member connected to the housing and provided with a valve seat to which the valve body is separated or seated, wherein the housing includes: - a tube-shaped member provided with a connector portion configured to be connected to an external power source; and - a cover member for shielding the tube-shaped member; - a heat generation portion formed of a first material; - a heat receiving portion formed of a second material and bonded to the heat generation portion; wherein the heat generating portion is a part of the tube-shaped member; wherein the heat receiving portion is part of the cover member; wherein said motor is disposed on the tube-shaped member; wherein an angle sensor for detecting the rotation angle of the rotor member is disposed on the cover member; and wherein the cover member comprises: - an insertion portion that fits inside an end portion of the tube-shaped member; and - ribs formed on an outer peripheral surface of the insertion portion; - a tube-shaped member provided with a connector portion configured to be connected to an external power source; and - a cover member for shielding the tube-shaped member; - a heat generation portion formed of a first material; - a heat receiving portion formed of a second material and bonded to the heat generation portion; wherein the heat generating portion is a part of the tube-shaped member; wherein the heat receiving portion is part of the cover member; wherein said motor is disposed on the tube-shaped member; wherein an angle sensor for detecting the rotation angle of the rotor member is disposed on the cover member; and wherein the cover member comprises: - an insertion portion that fits inside an end portion of the tube-shaped member; and - ribs formed on an outer peripheral surface of the insertion portion; wherein the heat generating portion is a part of the tube-shaped member; wherein the heat receiving portion is part of the cover member; wherein said motor is disposed on the tube-shaped member; wherein an angle sensor for detecting the rotation angle of the rotor member is disposed on the cover member; and wherein the cover member comprises: - an insertion portion that fits inside an end portion of the tube-shaped member; and - ribs formed on an outer peripheral surface of the insertion portion; - an insertion portion that fits inside an end portion of the tube-shaped member; and - ribs formed on an outer peripheral surface of the insertion portion; wherein a laser light transmittance in said first material is lower than a laser light transmittance in said second material, and the heat generation portion is welded to the heat receiving portion by irradiating the heat generation portion with a laser beam that has passed through the heat receiving portion.