An input apparatus comprising: a pressing part capable of reciprocating along a first direction; a spacer disposed in the first direction with respect to the pressing part, and capable of reciprocating along the first direction with reciprocation of the pressing part; a rotating cam that is disposed at a side of the spacer opposite to the pressing part and rotates in a plane perpendicular to the first direction with reciprocation of the spacer; and a sensor that detects rotation of the rotating cam, wherein either a plurality of projections are provided on a surface of the spacer facing the rotating cam, whereas a plurality of recesses are provided in the rotating cam at locations facing the plurality of projections of the spacer, or a plurality of projections are provided on a surface of the rotating cam facing the spacer, whereas a plurality of recesses are provided in the spacer at locations facing the plurality of projections of the rotating cam, each of the plurality of recesses has a slope, and pressing of the pressing part causes the spacer to be pressed, and at least one of the plurality of projections presses the slope so that the rotating cam rotates and the sensor detects rotation of the rotating cam, characterized in that the input apparatus further comprises a rotating manipulating unit at least partially disposed inside the pressing part, wherein the rotating manipulating unit is configured in such a manner that when the pressing part is pressed, the rotating manipulating unit presses the spacer by a bottom surface of the rotating manipulating unit, and when the pressing part is rotated, the rotating manipulating unit rotates in conjunction with rotation of the pressing part, and in that the spacer does not rotate in conjunction with rotation of the pressing part. a pressing part capable of reciprocating along a first direction; a spacer disposed in the first direction with respect to the pressing part, and capable of reciprocating along the first direction with reciprocation of the pressing part; a rotating cam that is disposed at a side of the spacer opposite to the pressing part and rotates in a plane perpendicular to the first direction with reciprocation of the spacer; and a sensor that detects rotation of the rotating cam, wherein either a plurality of projections are provided on a surface of the spacer facing the rotating cam, whereas a plurality of recesses are provided in the rotating cam at locations facing the plurality of projections of the spacer, or a plurality of projections are provided on a surface of the rotating cam facing the spacer, whereas a plurality of recesses are provided in the spacer at locations facing the plurality of projections of the rotating cam, a plurality of projections are provided on a surface of the spacer facing the rotating cam, whereas a plurality of recesses are provided in the rotating cam at locations facing the plurality of projections of the spacer, or a plurality of projections are provided on a surface of the rotating cam facing the spacer, whereas a plurality of recesses are provided in the spacer at locations facing the plurality of projections of the rotating cam, each of the plurality of recesses has a slope, and pressing of the pressing part causes the spacer to be pressed, and at least one of the plurality of projections presses the slope so that the rotating cam rotates and the sensor detects rotation of the rotating cam, characterized in that the input apparatus further comprises a rotating manipulating unit at least partially disposed inside the pressing part, wherein the rotating manipulating unit is configured in such a manner that when the pressing part is pressed, the rotating manipulating unit presses the spacer by a bottom surface of the rotating manipulating unit, and when the pressing part is rotated, the rotating manipulating unit rotates in conjunction with rotation of the pressing part, when the pressing part is pressed, the rotating manipulating unit presses the spacer by a bottom surface of the rotating manipulating unit, and when the pressing part is rotated, the rotating manipulating unit rotates in conjunction with rotation of the pressing part, and in that the spacer does not rotate in conjunction with rotation of the pressing part.