A refrigerator comprising: a body comprising an inner casing to form a storage chamber and an outer casing to form an exterior appearance of the refrigerator; an evaporator configured to generate cool air; a cool air duct assembly comprising: a front panel formed of a metal material and having a plurality of cool air outlets and a shelf unit fixing hole, the front panel forming a portion of a rear interior surface of the storage chamber; a cool air flow passage unit disposed between the front panel and the inner casing, the cool air flow passage unit comprising a first part disposed at a rear side of the front panel and a second part coupled to a rear side of the first part to form an air flow passage to receive the cool air generated by the evaporator, and a fan mounting unit provided at a lower side of the cool air flow passage unit and provided at an upper side of the evaporator; a fan mounted in the fan mounting unit and configured to blow the cool air generated by the evaporator; a shelf unit to divide the storage chamber horizontally; a support unit disposed between the cool air duct assembly and an inner casing of the body to support the shelf unit through the shelf unit fixing hole, wherein the first part comprises a plurality of discharge holes arranged to correspond with the plurality of cool air outlets of the front panel, such that the cool air generated by the evaporator is discharged to an inside of the storage chamber via the plurality of discharge holes and the plurality of cool air outlets. a body comprising an inner casing to form a storage chamber and an outer casing to form an exterior appearance of the refrigerator; an evaporator configured to generate cool air; a cool air duct assembly comprising: a front panel formed of a metal material and having a plurality of cool air outlets and a shelf unit fixing hole, the front panel forming a portion of a rear interior surface of the storage chamber; a cool air flow passage unit disposed between the front panel and the inner casing, the cool air flow passage unit comprising a first part disposed at a rear side of the front panel and a second part coupled to a rear side of the first part to form an air flow passage to receive the cool air generated by the evaporator, and a fan mounting unit provided at a lower side of the cool air flow passage unit and provided at an upper side of the evaporator; a front panel formed of a metal material and having a plurality of cool air outlets and a shelf unit fixing hole, the front panel forming a portion of a rear interior surface of the storage chamber; a cool air flow passage unit disposed between the front panel and the inner casing, the cool air flow passage unit comprising a first part disposed at a rear side of the front panel and a second part coupled to a rear side of the first part to form an air flow passage to receive the cool air generated by the evaporator, and a fan mounting unit provided at a lower side of the cool air flow passage unit and provided at an upper side of the evaporator; a fan mounted in the fan mounting unit and configured to blow the cool air generated by the evaporator; a shelf unit to divide the storage chamber horizontally; a support unit disposed between the cool air duct assembly and an inner casing of the body to support the shelf unit through the shelf unit fixing hole, wherein the first part comprises a plurality of discharge holes arranged to correspond with the plurality of cool air outlets of the front panel, such that the cool air generated by the evaporator is discharged to an inside of the storage chamber via the plurality of discharge holes and the plurality of cool air outlets.