In the hybrid-type construction machine, the control unit (60) includes a drive distributing unit (60-8) and an output condition calculating unit (60-9). The output condition calculating unit (60-9) calculates output conditions inclusive of an output setting of the electric storage device determined from a state of charge of the electric storage device (58), an output setting of the engine determined from a number of revolutions of the engine (50), a hydraulic load required value indicative of drive power required by the oil pressure generating unit, and an electric load required value indicative of electric power required by the electric drive unit. The drive distributing unit (60-8) determines output values of the electric drive unit and the hydraulic drive unit based on the calculated output conditions.