ATTITUDE ANGLE DERIVATION DEVICE AND ATTITUDE ANGLE SENSOR

According to one embodiment, an attitude angle derivation device includes an acquisition part, a storage, and a processor. The acquisition part is configured to acquire a rotation angle related to a first coordinate system. The rotation angle is obtained from an angle sensor located in an object. The storage is configured to store the rotation angle and an attitude angle. The attitude angle is related to a second coordinate system of the object. The processor is configured to acquire the rotation angle and the attitude angle, update the attitude angle based on a temporal change of the rotation angle derived from the rotation angle, and output the updated attitude angle.