INPUT/OUTPUT OPERATION DEVICE

An input/output operation device () includes: an operation part (); a movable unit () including a loosely fitted space inside, a main body supporting the operation part () and including a first loosely fitted surface () exposed in the loosely fitted space, and at least one drive magnet (); a fixed unit including a second loosely fitted surface () in point- or line-contact with the first loosely fitted surface of the movable unit, a holder () supporting the movable unit for free rotation, a base () including a space for accommodating at least a part of the movable unit and supporting the holder, and at least one drive coil (); a drive part to rotate the movable unit with respect to the fixed unit; and a detector to detect a position of the operation part in the fixed unit. One of the first and second loosely fitted surfaces includes an inner peripheral surface formed into a recessed portion, and another one of the first and second loosely fitted surfaces includes at least one protruded spherical surface.