A refrigerator comprising: a compressor and a condenser; a first inner case in which a first storage chamber is formed and a second inner case disposed next to each other and in which a second storage chamber is formed; a third inner case in which a third storage chamber is formed; a first evaporator disposed inside the first inner case; a second evaporator disposed inside the second inner case; and a duct including a first conduit for guiding air from the first inner case to the third inner case, and a second conduit for guiding air from the second inner case to the third inner case, the duct having a first inlet portion communicating with the first inner case, a second inlet portion communicating with the second inner case and an outlet portion communicating with the third inner case, characterized in that the refrigerator further comprises: a four way valve configured to switch a path of a refrigerant condensed in the condenser; a pair of main capillary tubes (7, 8) connected to the four way valve, the pair of main capillary tubes (7, 8) being connected to the first evaporator; a bypass capillary tube connected to the four way valve; an evaporator connection path configured to connect the first evaporator with the second evaporator, the second evaporator being connected in series with the first evaporator; a bypass path connected to the evaporator connection path and the bypass capillary tube to allow the refrigerant the refrigerant to bypass the first evaporator; and a damper disposed between the outlet portion of the duct and the third inner case and having a duct communication portion inserted into the outlet portion of the duct, wherein when the damper is opened, cold air of the first storage chamber and/or cold air of the second storage chamber flows to the third storage chamber through the duct. a compressor and a condenser; a first inner case in which a first storage chamber is formed and a second inner case disposed next to each other and in which a second storage chamber is formed; a third inner case in which a third storage chamber is formed; a first evaporator disposed inside the first inner case; a second evaporator disposed inside the second inner case; and a duct including a first conduit for guiding air from the first inner case to the third inner case, and a second conduit for guiding air from the second inner case to the third inner case, the duct having a first inlet portion communicating with the first inner case, a second inlet portion communicating with the second inner case and an outlet portion communicating with the third inner case, characterized in that the refrigerator further comprises: a four way valve configured to switch a path of a refrigerant condensed in the condenser; a pair of main capillary tubes (7, 8) connected to the four way valve, the pair of main capillary tubes (7, 8) being connected to the first evaporator; a bypass capillary tube connected to the four way valve; an evaporator connection path configured to connect the first evaporator with the second evaporator, the second evaporator being connected in series with the first evaporator; a bypass path connected to the evaporator connection path and the bypass capillary tube to allow the refrigerant the refrigerant to bypass the first evaporator; and a damper disposed between the outlet portion of the duct and the third inner case and having a duct communication portion inserted into the outlet portion of the duct, wherein when the damper is opened, cold air of the first storage chamber and/or cold air of the second storage chamber flows to the third storage chamber through the duct. a four way valve configured to switch a path of a refrigerant condensed in the condenser; a pair of main capillary tubes (7, 8) connected to the four way valve, the pair of main capillary tubes (7, 8) being connected to the first evaporator; a bypass capillary tube connected to the four way valve; an evaporator connection path configured to connect the first evaporator with the second evaporator, the second evaporator being connected in series with the first evaporator; a bypass path connected to the evaporator connection path and the bypass capillary tube to allow the refrigerant the refrigerant to bypass the first evaporator; and a damper disposed between the outlet portion of the duct and the third inner case and having a duct communication portion inserted into the outlet portion of the duct, wherein when the damper is opened, cold air of the first storage chamber and/or cold air of the second storage chamber flows to the third storage chamber through the duct.