A sensing apparatus according to the present invention includes a movable part rotatably supported by a base, a first input unit that is part or all of a first member formed integrally with or secured to the movable part, a second input unit that is part or all of a second member formed integrally with or secured to the movable part, a turning member turning together with the movable part, and a sensing element that is secured to a reference position of the base, senses a direction of the turning member relative to the reference position, and outputs a signal determined on the basis of the detected direction to identify a first linear displacement and a second linear displacement.