A motor-operated valve configured to be attached to a flow passage block , the motor-operated valve comprising: a valve body unit comprising an upper cylindrical portion and a lower cylindrical portion , in which a valve chamber (VC) provided with a valve seat is formed; a can having a cylindrical shape and coupled to the valve body unit ; a rotor provided in an interior of the can ; a conversion mechanism configured to convert a rotary movement of the rotor to an axial direction movement; a valve shaft passed through the upper cylindrical portion , that is attached to the conversion mechanism and configured to be displaced in an axial direction to thereby move toward or away from the valve seat ; a first gasket (GT1) having a sheet-like shape that is arranged between the upper cylindrical portion and the lower cylindrical portion and that extends in a direction orthogonal to an axis of the motor-operated valve ; and a second gasket (GT2) having a sheet-like shape that is arranged between the lower cylindrical portion and the flow passage block and that extends in a direction orthogonal to the axis of the motor-operated valve , wherein the first gasket (GT1) and the second gasket (GT2) are superposed when viewed in the axial direction of the motor-operated valve , characterized in that the second gasket (GT2) is pressed from both sides by a pressing surface of the lower cylindrical portion and a pressing surface of the flow passage block using an axial force generated by screw-engaging and relatively rotating a screw formed on the lower cylindrical portion and a screw formed on the flow passage block at an outer side in a radial direction of the second gasket (GT2). a valve body unit comprising an upper cylindrical portion and a lower cylindrical portion , in which a valve chamber (VC) provided with a valve seat is formed; a can having a cylindrical shape and coupled to the valve body unit ; a rotor provided in an interior of the can ; a conversion mechanism configured to convert a rotary movement of the rotor to an axial direction movement; a valve shaft passed through the upper cylindrical portion , that is attached to the conversion mechanism and configured to be displaced in an axial direction to thereby move toward or away from the valve seat ; a first gasket (GT1) having a sheet-like shape that is arranged between the upper cylindrical portion and the lower cylindrical portion and that extends in a direction orthogonal to an axis of the motor-operated valve ; and a second gasket (GT2) having a sheet-like shape that is arranged between the lower cylindrical portion and the flow passage block and that extends in a direction orthogonal to the axis of the motor-operated valve , wherein the first gasket (GT1) and the second gasket (GT2) are superposed when viewed in the axial direction of the motor-operated valve , characterized in that the second gasket (GT2) is pressed from both sides by a pressing surface of the lower cylindrical portion and a pressing surface of the flow passage block using an axial force generated by screw-engaging and relatively rotating a screw formed on the lower cylindrical portion and a screw formed on the flow passage block at an outer side in a radial direction of the second gasket (GT2). <EOS>