Abstract: An improved automatic spindle moving device for a tapping/drilling machine is disclosed. A worm is formed on a spindle in an elongate form in the lengthwise direction thereof, and a pair of worm wheels are meshed with the worm, while the worm wheels are supported by horizontal shafts. A braking means is installed on the leading end of the horizontal shaft, so that the worm wheels can be braked, thereby reducing the revolution speed of the spindle. The power corresponding to the revolution speed reduction is converted to elevating or lowering the spindle, so that the spindle should move up and down. Thus repeated automatic continuous tapping is rendered possible, and the up and down movements of the spindle can be arbitrarily adjusted. Further, during a drilling operation, holes can be drilled to a uniform depth repeatedly, while a pedal can be utilized in tapping or drilling. Thus tapping internal threads and drilling holes are rendered more convenient and easier.