An electric drill apparatus, comprising: a body; a motor for rotating an annular cutter, the motor mounted on the body; an arbor having an axis and adapted to hold the cutter coaxial with said axis; a feed mechanism responsive to an operation of a manual operation lever for moving the arbor along said axis to advance and retract the cutter attached to the arbor relative to a workpiece; an adhesion base held on a bottom of the body configured to secure the electric drill apparatus to the workpiece; and, an automatic motor stop/re-drive control circuit that comprises: a main switching element connected in series between the motor and a power supply; a current detector for detecting a load current flowing through the motor; a determination unit for determining whether the load current detected by the current detector exceeds a first predetermined reference value; and a control unit for controlling the main switching element to turn on/off, wherein when the determination unit determines that the load current exceeds the first reference value, the control unit turns off the main switching element to shut off the current flowing through the motor, characterised in that, subsequently when the determination unit determines that the load current decreases to be smaller than the first reference value, the control unit turns on the main switching element at a predetermined time after the determination, to supply the current from the power supply to the motor. a body; a motor for rotating an annular cutter, the motor mounted on the body; an arbor having an axis and adapted to hold the cutter coaxial with said axis; a feed mechanism responsive to an operation of a manual operation lever for moving the arbor along said axis to advance and retract the cutter attached to the arbor relative to a workpiece; an adhesion base held on a bottom of the body configured to secure the electric drill apparatus to the workpiece; and, an automatic motor stop/re-drive control circuit that comprises: a main switching element connected in series between the motor and a power supply; a current detector for detecting a load current flowing through the motor; a determination unit for determining whether the load current detected by the current detector exceeds a first predetermined reference value; and a control unit for controlling the main switching element to turn on/off, wherein when the determination unit determines that the load current exceeds the first reference value, the control unit turns off the main switching element to shut off the current flowing through the motor, characterised in that, subsequently when the determination unit determines that the load current decreases to be smaller than the first reference value, the control unit turns on the main switching element at a predetermined time after the determination, to supply the current from the power supply to the motor. a main switching element connected in series between the motor and a power supply; a current detector for detecting a load current flowing through the motor; a determination unit for determining whether the load current detected by the current detector exceeds a first predetermined reference value; and a control unit for controlling the main switching element to turn on/off, wherein when the determination unit determines that the load current exceeds the first reference value, the control unit turns off the main switching element to shut off the current flowing through the motor, characterised in that, subsequently when the determination unit determines that the load current decreases to be smaller than the first reference value, the control unit turns on the main switching element at a predetermined time after the determination, to supply the current from the power supply to the motor.