PROBLEM TO BE SOLVED: To solve a problem involved in a conventional device that since pressing force is calculated by regarding the entire spine as a rigid body, a load on each of five lumbar spines cannot be measured, and consequently, a load on the lumbar spines cannot be accurately measured.SOLUTION: A load calculation device includes: a position acquisition part for acquiring each position and direction of a plurality of lumbar spines in a user and a pressing force calculation part for calculating and outputting a load on each of the plurality of lumbar spines on the basis of each position and direction of the plurality of lumbar spines acquired by the position acquisition part.
