A refrigerator comprising: a main body provided with a storing chamber (11, 12) therein; a cool air generating chamber and a machine chamber provided with a compressor and a condenser, the cool air generating chamber and the machine chamber being provided above the main body; a defrosting water tray provided inside the cool air generating chamber to collect defrosting water; a water collecting tray provided below the main body; a hot pipe connecting the compressor with the condenser through the water collecting tray; a drain guide pipe mounted outside the main body and connected to the defrosting water tray and the water collecting tray to guide the defrosting water discharged from the defrosting water tray to the water collecting tray, wherein the hot pipe is provided inside or outside the drain guide pipe; a mounting groove provided on a rear surface of the main body to mount the drain guide pipe therein, wherein the mounting groove is arranged up and down on the rear surface of the main body to arrange the drain guide pipe up and down with respect to the main body; CHARACTERIZED IN THAT a connection hole provided in the mounting groove wherein the defrosting water discharged from the defrosting water tray passes through the connection hole; an inlet formed at one side of the drain guide pipe to correspond to the location of the connection hole and guide the defrosting water to the drain guide pipe; and an outlet provided below the drain guide pipe to guide the defrosting water flown into the drain guide pipe to the water collecting tray, wherein the hot pipe comprises a first hot pipe connected with the compressor provided inside the machine chamber, a second hot pipe connected with the condenser provided inside the machine chamber, and a third hot pipe connecting the first and second hot pipes with each other, arranged over a predetermined area of the water collecting tray, and the first and second hot pipes are arranged up and down in the drain guide pipe, and wherein the first hot pipe and the second hot pipe are received in the drain guide pipe. a main body provided with a storing chamber (11, 12) therein; a cool air generating chamber and a machine chamber provided with a compressor and a condenser, the cool air generating chamber and the machine chamber being provided above the main body; a defrosting water tray provided inside the cool air generating chamber to collect defrosting water; a water collecting tray provided below the main body; a hot pipe connecting the compressor with the condenser through the water collecting tray; a drain guide pipe mounted outside the main body and connected to the defrosting water tray and the water collecting tray to guide the defrosting water discharged from the defrosting water tray to the water collecting tray, wherein the hot pipe is provided inside or outside the drain guide pipe; a mounting groove provided on a rear surface of the main body to mount the drain guide pipe therein, wherein the mounting groove is arranged up and down on the rear surface of the main body to arrange the drain guide pipe up and down with respect to the main body; CHARACTERIZED IN THAT a connection hole provided in the mounting groove wherein the defrosting water discharged from the defrosting water tray passes through the connection hole; an inlet formed at one side of the drain guide pipe to correspond to the location of the connection hole and guide the defrosting water to the drain guide pipe; and an outlet provided below the drain guide pipe to guide the defrosting water flown into the drain guide pipe to the water collecting tray, wherein the hot pipe comprises a first hot pipe connected with the compressor provided inside the machine chamber, a second hot pipe connected with the condenser provided inside the machine chamber, and a third hot pipe connecting the first and second hot pipes with each other, arranged over a predetermined area of the water collecting tray, and the first and second hot pipes are arranged up and down in the drain guide pipe, and wherein the first hot pipe and the second hot pipe are received in the drain guide pipe.