A laundry treating apparatus includes a cabinet having an entrance and a door, a tub having a tub entrance, a drum within the tub having a drum entrance, an insulating part having a first fixing body, a second fixing body, a connecting body connecting the first and second fixing bodies together to form a space for storing liquid therebetween, and an inflow pipe through the first fixing body, a storage part within the cabinet to provide a space for storing detergent therein, a storage part connecting pipe discharging the detergent of the storage part, an insulating part connecting pipe connected to the inflow pipe, a trap forming pipe between the storage part connecting pipe and the insulating part connecting pipe, and a decelerating part provided to the insulating part connecting pipe to decelerate a flow speed of water moving from the trap forming pipe to the insulating part connecting pipe.