A refrigerator comprising: a body including a first inner case, a second inner case, and an outer case arranged on the outside of the first and second inner cases (11, 12); a freezing compartment provided in the inside of the first inner case; a freezing compartment cooling space arranged behind the freezing compartment and in the inside of the first inner case; a freezing compartment partition configured to divide the freezing compartment and the freezing compartment cooling space, the freezing compartment partition comprising a freezing compartment duct; an evaporator arranged in the freezing compartment cooling space and configured to generate cooling air; a plurality of refrigerating compartments (30, 40) provided in the inside of the second inner case to be adjacent to the freezing compartment in a horizontal direction from the freezing compartment, the plurality of refrigerating compartments (30, 40) comprising a first refrigerating compartment and a second refrigerating compartment; a plurality of refrigerating compartment cooling spaces (310, 320) arranged behind the plurality of refrigerating compartments (30, 40) and in the inside of the second inner case, the plurality of refrigerating compartment cooling spaces (310, 320) comprising a first refrigerating compartment cooling space arranged behind the first refrigerating compartment and a second refrigerating compartment cooling space arranged behind the second refrigerating compartment; and a cooling air supply duct (400, 400a) configured to allow cooling air generated by the evaporator to be supplied to the plurality of refrigerating compartments (30, 40), wherein the cooling air supply duct (400, 400a) comprises a cooling air inlet (412, 422, 900) arranged above the evaporator and behind the freezing compartment, characterized in that the cooling air supply duct (400, 400a) is arranged outside of the rear side of the first and second inner cases (11,12) and inside the outer case. a body including a first inner case, a second inner case, and an outer case arranged on the outside of the first and second inner cases (11, 12); a freezing compartment provided in the inside of the first inner case; a freezing compartment cooling space arranged behind the freezing compartment and in the inside of the first inner case; a freezing compartment partition configured to divide the freezing compartment and the freezing compartment cooling space, the freezing compartment partition comprising a freezing compartment duct; an evaporator arranged in the freezing compartment cooling space and configured to generate cooling air; a plurality of refrigerating compartments (30, 40) provided in the inside of the second inner case to be adjacent to the freezing compartment in a horizontal direction from the freezing compartment, the plurality of refrigerating compartments (30, 40) comprising a first refrigerating compartment and a second refrigerating compartment; a plurality of refrigerating compartment cooling spaces (310, 320) arranged behind the plurality of refrigerating compartments (30, 40) and in the inside of the second inner case, the plurality of refrigerating compartment cooling spaces (310, 320) comprising a first refrigerating compartment cooling space arranged behind the first refrigerating compartment and a second refrigerating compartment cooling space arranged behind the second refrigerating compartment; and a cooling air supply duct (400, 400a) configured to allow cooling air generated by the evaporator to be supplied to the plurality of refrigerating compartments (30, 40), wherein the cooling air supply duct (400, 400a) comprises a cooling air inlet (412, 422, 900) arranged above the evaporator and behind the freezing compartment, characterized in that the cooling air supply duct (400, 400a) is arranged outside of the rear side of the first and second inner cases (11,12) and inside the outer case.