Disclosed herein is a motor drive unit. The motor drive unit includes a base part; a middle base part disposed above the base part; a heat discharging part mounted on the base part and disposed under the middle base part to slide on the middle base part, wherein an area in which the heat discharging part is installed is smaller than an area of the middle base part; and a power PCB part disposed above the middle base part, an EMC PCB part disposed above the power PCB part with a spacing; a control PCB part coupled with a side portion of the power PCB part; and a condenser unit penetrating the middle base part to be fixed to it, wherein a lower end of the condenser unit is disposed on a side of the heat discharging part.