An input apparatus according to one embodiment of the present invention may include an operation member that is rotatable and is movable in a direction along a rotation axis between an extended position and a pushed-in position. When a user rotates the operation member without pushing in it, a detection output of a predetermined number of pulses can be obtained from a first detection unit each time the operation member is rotated at a predetermined angle. When a user pushes in the operation member and rotates it at a predetermined angle, detection outputs can be continuously obtained from a second detection unit. Consequently, a user can perform a rough retrieval operation on a data set-by-data set basis and a fine data selection operation on a data-by-data basis using a single operation member without repositioning the user's hand.