Input/output operation device

An input/output operation device, comprising:

• an actuator comprising:
• a movable unit comprising an operation part, which has a surface with which a finger comes in contact, and one of a recessed contact surface and a protruded spherical surface located inside, the movable unit being freely rotatable independently about two axes orthogonal to each other;
• a fixed unit comprising another one of the recessed contact surface and the protruded spherical surface to which the one of the recessed contact surface and the protruded spherical surface of the movable unit loosely fit, the one of the recessed contact surface and the protruded spherical surface of the movable unit and the another one of the recessed contact surface and the protruded spherical surface being in point- or line-contact with each other, the fixed unit supporting, for free rotation, the movable unit about a spherical center of the protruded spherical surface;
• and
• a drive part driving the movable unit with respect to the fixed unit;
• a detection circuit part to output a position signal corresponding to a position of the operation part;
• a drive circuit part controlling the drive part;
• a control calculation processing part controlling the drive circuit part;
• and
• a rotation body on which the actuator is installed, and which rotates about a rotation axis,
• wherein the control calculation processing part controls the drive of the operation part through use of a coordinate system stationary with respect to a reference rotation angle of the rotation body at different rotation angles of the rotation body.