A refrigerator, comprising: a main body; a refrigerating chamber defined at a first portion of the main body; a freezing chamber defined at a second portion of the main body, wherein the freezing chamber and the refrigerating chamber are defined in the main body in parallel with each other; a cold air generation chamber for the freezing chamber defined at an uppermost part of the main body and configured to generate cold air used in regulating temperature of the freezing chamber, wherein the cold air generation chamber for the freezing chamber is disposed on the upper part of the freezing chamber so that the cold air can circulate up and down; and a cold air generation chamber for the refrigerating chamber defined at the uppermost part of the main body and configured to generate cold air used in regulating temperature of the refrigerating chamber, wherein the cold air generation chamber for the refrigerating chamber is disposed on the upper part of the refrigerating chamber; and a machine room defined at the uppermost part of the main body, characterized in that the machine room is positioned between the cold air generation chamber for the freezing chamber and the cold air generation chamber for the refrigerating chamber, wherein the machine room is installed on a central portion of the upper part of the main body in a front surface of the refrigerator, in that the cold air generation chamber for the freezing chamber and the cold air generation chamber for the refrigerating chamber are disposed at opposite sides of the machine room on the uppermost part of the main body, respectively, and in that the cold air generated by the cold air generation chamber for the freezing chamber flows into only the freezing chamber and the cold air generated by the cold air generation chamber for the refrigerating chamber flows into only the refrigerating chamber. a main body; a refrigerating chamber defined at a first portion of the main body; a freezing chamber defined at a second portion of the main body, wherein the freezing chamber and the refrigerating chamber are defined in the main body in parallel with each other; a cold air generation chamber for the freezing chamber defined at an uppermost part of the main body and configured to generate cold air used in regulating temperature of the freezing chamber, wherein the cold air generation chamber for the freezing chamber is disposed on the upper part of the freezing chamber so that the cold air can circulate up and down; and a cold air generation chamber for the refrigerating chamber defined at the uppermost part of the main body and configured to generate cold air used in regulating temperature of the refrigerating chamber, wherein the cold air generation chamber for the refrigerating chamber is disposed on the upper part of the refrigerating chamber; and a machine room defined at the uppermost part of the main body, characterized in that the machine room is positioned between the cold air generation chamber for the freezing chamber and the cold air generation chamber for the refrigerating chamber, wherein the machine room is installed on a central portion of the upper part of the main body in a front surface of the refrigerator, in that the cold air generation chamber for the freezing chamber and the cold air generation chamber for the refrigerating chamber are disposed at opposite sides of the machine room on the uppermost part of the main body, respectively, and in that the cold air generated by the cold air generation chamber for the freezing chamber flows into only the freezing chamber and the cold air generated by the cold air generation chamber for the refrigerating chamber flows into only the refrigerating chamber.