It is an object to provide a body distortion detection system for detecting distortion of the body from postures of natural manners in daily action of an examinee. A body distortion detection system includes a posture detection apparatus mounted on the body of an examinee, and a distortion determination apparatus. Upon acquiring acceleration information periodically from an acceleration sensor mounted on a part for detecting a movement of the body of the examinee, the posture detection apparatus calculates a moving distance of the part from the acquired acceleration information to obtain coordinates of the part in a computation processing section. Then, the apparatus stores coordinates obtained by the computation processing section point by point in memory. The distortion determination apparatus determines distortion of the body, based on a tilt angle of the part calculated from a series of coordinates read by connection to the memory.
