A lens barrel incorporating a lens driving device is provided which includes a fixed frame, a cam ring inserted into the fixed frame in freely rotatable fashion, first and free forward and backward motion, and an aperture ring supported by the first group lens frame in a freely rotatable manner. In the cam ring, there are provided a diagonal cam groove which drives the first and second group lens frames to zoom positions in stages, circumferential-direction cam grooves which hold each zoom position, and aperture cam grooves which drive the aperture ring. In a state in which the first and second group lens frames are positioned and fixed at respective zoom positions, the cam ring can be rotated to rotate the aperture ring, thereby setting the aperture value of the pickup lenses.