Provided is an information input device that allows two types of operation, namely, rotation operation and tilt operation, and that can be downsized. In a case where the rotation operation component is seen in a direction orthogonal to a rotation axis direction of the rotation operation component, the rotation operation component has a first slope that faces a tilt operation component and that is on an inner periphery side of an annular shape of the rotation operation component and is inclined relative to the rotation axis of the rotation operation component. In the case where the rotation operation component is seen in the direction orthogonal to the rotation axis direction of the rotation operation component, a distance of the first slope from the rotation axis of the rotation operation component increases as a distance of the first slop from the rotation detection unit increases.