Abstract: An apparatus for automatically crimping terminals to electric wires by a cooperation between a pressing punch driven through a press ram and a stationary anvil. The apparatus has a crimp height adjusting mechanism which includes a tapered spacer movable perpendicularly to the press ram, a stopper member having a complementary tapered surface and slidably placed on the tapered spacer so as to be able to move only vertically as the tapered spacer is moved. The stopper member has an upper surface adapted to be contacted by a portion of the press ram thereby determining the stroke end of the press ram. The tapered spacer is slidingly moved in a controlled manner by an electric motor, so that the heightwise position of the stopper member is changed to allow a delicate adjustment of the lower stroke end of the press ram. In consequence, the crimp height is automatically adjusted minutely in accordance with the diameter of the electric wire to be processed.