To provide a lens centering and edging machine having an alignment adjusting mechanism capable of adjusting the alignment of a lens shaft with a clamp shaft easily in a short time.

In this lens centering and edging machine 1, the parallelism and angle of a lens shaft housing 15 in the longitudinal direction can be adjusted by adjusting the tightened amounts of four pressing screws 51-54 screwed into the lens shaft housing 15, and the parallelism and angle of the lens shaft housing 15 in the lateral direction can also be adjusted by adjusting the screwed amounts of two left side pressing screws 61, 62 and two right side pressing screws 63, 64. Consequently, the alignment of the lens shaft 16 supported on the lens shaft housing 15 with the clamp shaft 7 can be adjusted using eight pressing screws easily in a short time.