A washing machine, comprising: a body which forms an appearance; a reservoir provided in the body; a drum provided in the reservoir; a driving motor provided on a bottom surface of the reservoir and having a stator and a rotor; a washing shaft with one end protruding to the inside of the drum, wherein the protruding end is coupled to a pulsator, wherein the washing shaft is configured to rotate the pulsator, and wherein the washing shaft is coupled to the rotor to transmit a rotational force of the rotor to the washing shaft; a dehydration shaft configured to rotate the drum; a clutch to selectively couple with the rotor, wherein said coupling is configured to transmit the rotational force of the rotor to the dehydration shaft, wherein the clutch is moveable to a down position for coupling with the rotor and an up position for releasing a coupled state with the rotor, characterized in that the washing machine further comprises: an extended surface having a ring shape which outwardly extends from a center of the clutch and being provided at an upper part of the clutch; a shielding member (41, 43, 44, 45, 70) formed of a steel-based metallic material and concentrically coupled to a lower surface of the extended surface without being influenced from rotation of the clutch; at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d); and at least one magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) disposed to face the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) by being outward spaced from the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) by a predetermined gap, wherein the magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) senses a change in magnetic field from the magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) caused by the shielding member (41, 43, 44, 45, 70) shielding a space between the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) and the magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) by a motion of the clutch between the down position or the up position, the change in magnetic field indicating a position of the clutch. a body which forms an appearance; a reservoir provided in the body; a drum provided in the reservoir; a driving motor provided on a bottom surface of the reservoir and having a stator and a rotor; a washing shaft with one end protruding to the inside of the drum, wherein the protruding end is coupled to a pulsator, wherein the washing shaft is configured to rotate the pulsator, and wherein the washing shaft is coupled to the rotor to transmit a rotational force of the rotor to the washing shaft; a dehydration shaft configured to rotate the drum; a clutch to selectively couple with the rotor, wherein said coupling is configured to transmit the rotational force of the rotor to the dehydration shaft, wherein the clutch is moveable to a down position for coupling with the rotor and an up position for releasing a coupled state with the rotor, characterized in that the washing machine further comprises: an extended surface having a ring shape which outwardly extends from a center of the clutch and being provided at an upper part of the clutch; a shielding member (41, 43, 44, 45, 70) formed of a steel-based metallic material and concentrically coupled to a lower surface of the extended surface without being influenced from rotation of the clutch; at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d); and at least one magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) disposed to face the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) by being outward spaced from the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) by a predetermined gap, wherein the magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) senses a change in magnetic field from the magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) caused by the shielding member (41, 43, 44, 45, 70) shielding a space between the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) and the magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) by a motion of the clutch between the down position or the up position, the change in magnetic field indicating a position of the clutch. an extended surface having a ring shape which outwardly extends from a center of the clutch and being provided at an upper part of the clutch; a shielding member (41, 43, 44, 45, 70) formed of a steel-based metallic material and concentrically coupled to a lower surface of the extended surface without being influenced from rotation of the clutch; at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d); and at least one magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) disposed to face the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) by being outward spaced from the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) by a predetermined gap, wherein the magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) senses a change in magnetic field from the magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) caused by the shielding member (41, 43, 44, 45, 70) shielding a space between the at least one magnet (42, 63a, 63b, 55b, 55d, 63c, 63d) and the magnetic sensor (50, 62a, 62b, 55a, 55c, 62c, 62d) by a motion of the clutch between the down position or the up position, the change in magnetic field indicating a position of the clutch.