Provided is a posture detection apparatus that can detect the posture of a target with lower power consumption, on a smaller scale, and with lower cost. A step count detection unit 951 detects one step (a step count) on the basis of the acceleration from an acceleration sensor 71, and outputs the detection result to an acceleration accumulation unit 953. The acceleration accumulation unit 953 calculates, within a period of time corresponding to the one step detected by the step count detection unit 951, an acceleration cumulative value (simple posture pitch angle) by accumulating the acceleration detected by the acceleration sensor 71. The posture detection unit 955 detects, on the basis of the acceleration cumulative value calculated by the acceleration accumulation unit 953, the posture of a portion for which the acceleration sensor 71 is provided.
