A rotary input apparatus is disclosed. The rotary input apparatus comprising a wheel of circular shape having an insertion hole, a center key inserted into the insertion hole and having one or more securing grooves, a magnet joined to a surface of the wheel to co-operate with the wheel and magnetized to have alternating N- and S-poles, a detection element positioned to face the magnet for detecting the rotation of the magnet, a printed circuit board on which the detection element mounted, a base to which the printed circuit board is secured and which has one or more support protrusions that are inserted into the securing grooves, and a holder joined to the base and interposed between the wheel and the base to rotatably support the wheel, allows greater aesthetic value as the center key is not rotated and always maintains a constant orientation.