Disclosed is a built-in refrigerator provided in a sink (1) and effectively discharging heat from a condenser (40) and a compressor (30). The built-in refrigerator includes a cabinet (10) provided in the sink (1) and a component chamber (11) at a rear bottom thereof and a dust guard (20) provided at a front bottom of the cabinet (10); a compressor (30) provided in the component chamber (11); a condenser (40) provided under a bottom surface of the cabinet (10); a ventilating passage (60) communicating the component chamber (11) with a bottom of the cabinet (10) and outside of the dust guard (20) for discharging heat generated from the condenser (40) and the compressor (30) to outside; and a cooling fan (50) provided in the component chamber (11) for cooling the compressor (30) and the condenser (40).