The present invention provides an engine-generator starting apparatus. A compression stroke can be easily crossed without specifically increasing a current value. The engine-generator starting apparatus comprises: a power generation portion 2 which comprises a three-phase winding 24 and carries out relative rotation on the rotation of the crankshaft of an engine 1; an inversion unit which convertsthe alternating-current power output from the power generation portion 2 into alternating-current power of a predetermined frequency and outputs the alternating-current power to the load; and a control unit 50 which controls electrification to the three-phase winding 24 of the power generation portion from the inversion unit 3 so as to allow the crankshaft to rotate to start the engine 1. The control unit 50 comprises a first current control part 51 which conducts the first current of the stopping degree of a piston during a compression process, a second current control part 52 which conductsthe second current larger than the first current so as to allow the crankshaft to positively rotate and an ignition control part 53 which ignites fuels supplied to the engine 1.