A laundry treating apparatus comprising: a cabinet having a front face with a drawer hole defined therein, and a rear cover for forming a rear face of the cabinet ; a drawer including a drawer body extendable from the cabinet through the drawer hole , a drawer cover for forming a top face of the drawer body , and a cover through-hole defined to penetrate the drawer cover , wherein the cover through-hole is exposed to the outside of the cabinet when the drawer body is extended from the cabinet ; a tub including a tub body disposed inside the drawer and storing water therein, a tub cover for forming a top face of the tub body , and an inlet defined to penetrate the tub cover , wherein the inlet is exposed to the outside of the drawer through the cover through-hole ; a drum rotatably disposed in the tub , wherein the drum accommodates laundry; a gasket fixed to the tub cover and surrounding an edge of the inlet ; and a door for closing the inlet by pressing the gasket ; a first guide and a second guide for providing a path for the door to reciprocate between a first point (P1) where the inlet is closed and a second point (P2) where the inlet is opened in a space defined between the tub cover and the drawer cover , wherein the first guide and the second guide are respectively disposed on portions to the left and to the right of the inlet ; characterized in that the laundry treatment apparatus further comprises: a third guide for providing the path for the door to reciprocate between the first point (P1) and the second point (P2), wherein the third guide extends from a rear end of the inlet toward a rear end of the tub cover , wherein the third guide is positioned between the first guide and the second guide ; and a door lock for detachably fixing the door to a point positioned in front of the inlet in a space provided by the tub cover when the door is located at the first point (P1). a cabinet having a front face with a drawer hole defined therein, and a rear cover for forming a rear face of the cabinet ; a drawer including a drawer body extendable from the cabinet through the drawer hole , a drawer cover for forming a top face of the drawer body , and a cover through-hole defined to penetrate the drawer cover , wherein the cover through-hole is exposed to the outside of the cabinet when the drawer body is extended from the cabinet ; a tub including a tub body disposed inside the drawer and storing water therein, a tub cover for forming a top face of the tub body , and an inlet defined to penetrate the tub cover , wherein the inlet is exposed to the outside of the drawer through the cover through-hole ; a drum rotatably disposed in the tub , wherein the drum accommodates laundry; a gasket fixed to the tub cover and surrounding an edge of the inlet ; and a door for closing the inlet by pressing the gasket ; a first guide and a second guide for providing a path for the door to reciprocate between a first point (P1) where the inlet is closed and a second point (P2) where the inlet is opened in a space defined between the tub cover and the drawer cover , wherein the first guide and the second guide are respectively disposed on portions to the left and to the right of the inlet ; a third guide for providing the path for the door to reciprocate between the first point (P1) and the second point (P2), wherein the third guide extends from a rear end of the inlet toward a rear end of the tub cover , wherein the third guide is positioned between the first guide and the second guide ; and a door lock for detachably fixing the door to a point positioned in front of the inlet in a space provided by the tub cover when the door is located at the first point (P1). <EOS>