The herniated lumbar disc is one of the common causes to produce low-back pain. The plain films of lateral lumbar spine of one hundred cases of the herniated lumbar disc and another one hundred cases of normal patients proved on myelograms were studied. The heights of the lumbar vertebral bodies, and the lumbar lordosis were measured. The results are as follows: 1. The mean height of the 3rd lumbar spinal body is largest among the lumbar spines and the upper 2 lumbar spines show an anterior wedging and the lower 2 spines show a posterior wedging. 2. The heights of the lumbar disc spaces have increasing tendency down to the L4 and L5 interspace. The height of L5 and S1 interspace is most variable and the mean is almost equal with that of L3 and L4 interspace in male and of L4 and L5 interspace in female, 3. In cases of herniated disc between L4 and L5, about 45% of the patients has narrowed disc space smaller than that of L3 and L4. 4. In the patients with herniated lumbar disc the mean values of lumbar disc spaces are evidently decreased upto 3mm. than those in the normal group. 5. In normal group the overall mean depth of the lumbar lordosis is 8.4mm. in male and 8.33mm. in female, and they show significant decrease in the disc group. 6. The overall mean degree of the lumar lordosis is 4.59% in normal group and it is slightly decreased in disc group as 3.66%. 7. In case of the narrowed disc space 2mm. more than the normal value, the coexistence of narrowing of disc space more than 2mm. from the value of the just above space is evident sign of heriated lumbar disc.