An under counter type refrigerator, capable of being installable in at least one or more storage spaces of a plurality of storage spaces of a kitchen furniture provided with a main body having a first width (W1) in a lateral direction, which is greater than a second width (W2) in a front and rear direction or a third width (W3) in a vertical direction, and the plurality of storage spaces arranged in the lateral direction, the under counter type refrigerator comprising: a main body defining at least one of a first and second storage compartments ; an evaporator to generate cool air to be supplied to the at least one of the first and second storage compartments ; and a machine room provided at a lower portion of the main body to define an installation space in which a compressor and a condenser are provided, wherein the machine room comprises: a suction portion provided in front of the main body to suction outside air into the machine room ; a discharge portion provided in front of the main body to discharge the outside air in the machine room ; a guide wall to separate the installation space into a first space in which the condenser is installed, and a second space in which the compressor is installed; and a condensation fan installed at a rear side of the guide wall , the compressor and the condensation fan being aligned in the lateral direction, wherein the first space provides a suction-side passage of the condensation fan and the second space provides a discharge-side passage of the condensation fan , and a width (A2) of the second space in the lateral direction is greater than a width (A1) of the first space with respect to the condensation fan , characterised in that the machine room further comprises a defrosting water tray installed in the first space , a tray pipe provided in the defrosting water tray and through which a refrigerant compressed in the compressor flows, a control box installed in the second space , and the control box is disposed in front of the compressor . a main body defining at least one of a first and second storage compartments ; an evaporator to generate cool air to be supplied to the at least one of the first and second storage compartments ; and a machine room provided at a lower portion of the main body to define an installation space in which a compressor and a condenser are provided, wherein the machine room comprises: a suction portion provided in front of the main body to suction outside air into the machine room ; a discharge portion provided in front of the main body to discharge the outside air in the machine room ; a guide wall to separate the installation space into a first space in which the condenser is installed, and a second space in which the compressor is installed; and a condensation fan installed at a rear side of the guide wall , a suction portion provided in front of the main body to suction outside air into the machine room ; a discharge portion provided in front of the main body to discharge the outside air in the machine room ; a guide wall to separate the installation space into a first space in which the condenser is installed, and a second space in which the compressor is installed; and a condensation fan installed at a rear side of the guide wall , the compressor and the condensation fan being aligned in the lateral direction, wherein the first space provides a suction-side passage of the condensation fan and the second space provides a discharge-side passage of the condensation fan , and a width (A2) of the second space in the lateral direction is greater than a width (A1) of the first space with respect to the condensation fan , characterised in that the machine room further comprises a defrosting water tray installed in the first space , a tray pipe provided in the defrosting water tray and through which a refrigerant compressed in the compressor flows, a control box installed in the second space , and the control box is disposed in front of the compressor . <EOS>