PURPOSE: To deliver and feed an amount of a bar electrode consumed during electric discharge machining properly equivalent to the consumed amount by providing first and second grip units for carrying out gripping and releasing action on the bar electrode for machining narrow holes.

CONSTITUTION: A case 30 to store a bar electrode 34 for machining a narrow hole, a means 33 to turn this case 30, first and second gripping means 35, 36 for gripping and releasing the bar electrode 34 in accordance with a narrow hole machining program and a delivery and feed means 37 for moving the bar electrode 34 in the shaft direction in connection with the motion of these gripping means are provided. Subsequently, the bar electrode 34 is delivered and fed every specific period of time by way of repeatedly actuating these first and second grip means 35, 36 and the delivery and feed means 37 in accordance with the narrow hole machining program.