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 in a lateral direction, which is greater than a second width in a front and rear direction or a third width 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 (121, 122); an evaporator (131, 141) to generate cool air to be supplied to the at least one of the first and second storage compartments (121, 122); and a machine room (200, 200a) 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 (200, 200a) comprises: a suction portion provided in front of the main body to suction outside air into the machine room (200, 200a); a discharge portion provided in front of the main body to discharge the outside air in the machine room (200, 200a); 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 (245, 245a) installed at a rear side of the guide wall, the compressor and the condensation fan (245, 245a) 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 of the second space in the lateral direction is greater than a width of the first space with respect to the condensation fan, characterised in that the machine room (200, 200a) 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 (121, 122); an evaporator (131, 141) to generate cool air to be supplied to the at least one of the first and second storage compartments (121, 122); and a machine room (200, 200a) 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 (200, 200a) comprises: a suction portion provided in front of the main body to suction outside air into the machine room (200, 200a); a discharge portion provided in front of the main body to discharge the outside air in the machine room (200, 200a); 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 (245, 245a) 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 (200, 200a); a discharge portion provided in front of the main body to discharge the outside air in the machine room (200, 200a); 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 (245, 245a) installed at a rear side of the guide wall, the compressor and the condensation fan (245, 245a) 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 of the second space in the lateral direction is greater than a width of the first space with respect to the condensation fan, characterised in that the machine room (200, 200a) 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.