Among the various roentgenological examination for the patient with vertebral disease, the routine antero-posterior view of the X-ray film of the spine particularly gave the great contribution and aid for the diagnosis of the intraspinal tumor or congenital stenois of the spinal canal. The author observed the antero-posterior view X-ray films of the 480 normal Korean adults which were composed of 240 males and females each, and measured the interpediculate distances that were the shortest distance betwee the inner margin of both right and left pedicle of cervical, thoracic and lumbar vertebrae on the antero-[posterior view films, and composed the results by sex and age groups. Statistical analysis of mean values, standard deviation and mean errors of the measured interpediculate distance showed the significance in analysis variance between male and female and that male had greater values than female, but showed nos significance in analysis variance between each age groups. The mean values of the normal interpediculate distances in Korean adults were as followings. 1. The mean values of the normal interpediculate distances in mlae. 2. The mean values of the normal interpediculate distances in female. Clinically useful 90% tolerance range test were made on the normal values of the interpediculate distanceof the Korean male and female. The upper limit of the tolerance range of the Korean adult showed smaller value than those of the American and Europian.