PURPOSE: To obtain an electric charging system for a storage battery type submersible body which can operate for a long time, without being restrained by a connection cable and possesses the high performance with the large degree of freedom in movement.

CONSTITUTION: An electric charging system for a submersible body is equipped with a dynamic 34 for charge which is installed on a submersible body 31, dynamo driving shaft 35 which is connected with the dynamo 34 and whose outer end projects into the outside sea water, automatic steering circuit which receives the output signal of a transponder 33 installed on a cable-connected unmanned machine 1 and controls the propulsion device of the submersible body 31 and docks the front end of the submersible body 31 with the rear end of the cable-connected unmanned machine 1, and a propulsion device 2 which is projectingly installed at the front end of the unmanned machine 1 and is driven by a built-in motor. Further, the electric charge system is equipment with an automatic steering circuit which receives the output signal of the transponder 33 of the submersible body 31 and controls the propulsion device 2 of the unmanned machine 1 and docks the rear end with the front end of the submersible body 31, fitting/disengaged type torque coupling which is dividedly installed at each outer end of the dynamo driving shaft 35 and the rotary shaft 7 of the motor 6, and the coupling arms 38 and 11 which are projectingly installed on one between the front end of the submersible body 31 and the rear end of the unmanned machine 1.