A laundry treating apparatus comprising: a cabinet provided with an inlet and a door for opening or closing the inlet; a tub providing a space for storing water, having a tub inlet provided on a surface headed for a direction where the inlet is arranged; a drum rotatably provided inside the tub, providing a space for storing laundry, and having a drum inlet provided on a surface headed for a direction where the inlet is arranged; an insulator including a first clamp body of a cylindrical shape fixed to the inlet, a second clamp body of a cylindrical shape fixed to the tub inlet, a connecting body connecting the first clamp body with the second clamp body and forming a space between the first clamp body and the second clamp body to store a liquid, and an inlet pipe provided to pass through the first clamp body; a storage provided inside the cabinet, providing a space for storing a detergent; a storage connecting pipe configured to discharge the detergent of the storage; an insulator connecting pipe connected to the inlet pipe; a trap forming pipe forming any one of a P trap, a U trap and an S trap between the storage connecting pipe and the insulator connecting pipe; a guide provided in a space arranged above a horizontal line passing through the rotation center of the drum in a space provided by the first clamp body, guiding the liquid discharged from the inlet pipe toward the tub inlet; and a connecting path provided to connect the guide with the connecting body, characterized in that: the connecting path is provided at a corner of the guide as a groove that is configured to connect an inner space of the guide with the connecting body,_such that a liquid moving along the guide at a speed less than a reference speed will move toward a corner of the guide and then be supplied to the connecting body through the groove. a cabinet provided with an inlet and a door for opening or closing the inlet; a tub providing a space for storing water, having a tub inlet provided on a surface headed for a direction where the inlet is arranged; a drum rotatably provided inside the tub, providing a space for storing laundry, and having a drum inlet provided on a surface headed for a direction where the inlet is arranged; an insulator including a first clamp body of a cylindrical shape fixed to the inlet, a second clamp body of a cylindrical shape fixed to the tub inlet, a connecting body connecting the first clamp body with the second clamp body and forming a space between the first clamp body and the second clamp body to store a liquid, and an inlet pipe provided to pass through the first clamp body; a storage provided inside the cabinet, providing a space for storing a detergent; a storage connecting pipe configured to discharge the detergent of the storage; an insulator connecting pipe connected to the inlet pipe; a trap forming pipe forming any one of a P trap, a U trap and an S trap between the storage connecting pipe and the insulator connecting pipe; a guide provided in a space arranged above a horizontal line passing through the rotation center of the drum in a space provided by the first clamp body, guiding the liquid discharged from the inlet pipe toward the tub inlet; and a connecting path provided to connect the guide with the connecting body, characterized in that: the connecting path is provided at a corner of the guide as a groove that is configured to connect an inner space of the guide with the connecting body,_such that a liquid moving along the guide at a speed less than a reference speed will move toward a corner of the guide and then be supplied to the connecting body through the groove.