A laundry treatment apparatus comprising: a cabinet to form the external appearance of the laundry treatment apparatus, the cabinet having an opening; a drawer configured to be withdrawable from the cabinet through the opening; a tub provided inside the drawer and configured to receive water; an introduction aperture provided to penetrate the upper surface of the tub; and a drum rotatably provided inside the tub for receiving laundry supplied to the introduction aperture; characterized by: a door configured to open and close the introduction aperture, the door being coupled to one of the drawer or the tub and a door sensing unit configured to sense whether or not the door to open the introduction aperture is opened, wherein the door sensing unit includes: a magnetic-force sensor provided at the inner side of the cabinet facing the upper surface of the door, and a magnetic-force generator rotatably provided at the inner side of the cabinet and spaced apart from the magnetic-force sensor, wherein a distance between the sensor and the magnetic-force generator is changed as the door opens the introduction aperture and the door rotates the magnetic-force generator. a cabinet to form the external appearance of the laundry treatment apparatus, the cabinet having an opening; a drawer configured to be withdrawable from the cabinet through the opening; a tub provided inside the drawer and configured to receive water; an introduction aperture provided to penetrate the upper surface of the tub; and a drum rotatably provided inside the tub for receiving laundry supplied to the introduction aperture; characterized by: a door configured to open and close the introduction aperture, the door being coupled to one of the drawer or the tub and a door sensing unit configured to sense whether or not the door to open the introduction aperture is opened, wherein the door sensing unit includes: a magnetic-force sensor provided at the inner side of the cabinet facing the upper surface of the door, and a magnetic-force generator rotatably provided at the inner side of the cabinet and spaced apart from the magnetic-force sensor, wherein a distance between the sensor and the magnetic-force generator is changed as the door opens the introduction aperture and the door rotates the magnetic-force generator. a door configured to open and close the introduction aperture, the door being coupled to one of the drawer or the tub and a door sensing unit configured to sense whether or not the door to open the introduction aperture is opened, wherein the door sensing unit includes: a magnetic-force sensor provided at the inner side of the cabinet facing the upper surface of the door, and a magnetic-force generator rotatably provided at the inner side of the cabinet and spaced apart from the magnetic-force sensor, wherein a distance between the sensor and the magnetic-force generator is changed as the door opens the introduction aperture and the door rotates the magnetic-force generator. a magnetic-force sensor provided at the inner side of the cabinet facing the upper surface of the door, and a magnetic-force generator rotatably provided at the inner side of the cabinet and spaced apart from the magnetic-force sensor, wherein a distance between the sensor and the magnetic-force generator is changed as the door opens the introduction aperture and the door rotates the magnetic-force generator.