A power supply pack structure includes a battery set having a positive terminal and a negative terminal, a battery case housing the battery set, a total positive cable having both ends connected to the positive terminal and an apparatus, respectively, and a total negative cable having both ends connected to the negative terminal and the apparatus, respectively. The battery case has an opening formed therein for accessing the apparatus. In the state where the apparatus is not disposed in the battery case, at least one of a condition that length L1 of the total positive cable is shorter than the shortest distance between the positive terminal and the opening and a condition that length L2 of the total negative cable is shorter than the shortest distance between the negative terminal and the opening is satisfied. This configuration provides a power supply pack structure that prevents the cable from being accidentally touched.