Input/output operation device

An input/output operation device, comprising:

• an operation part comprising a surface to be operated by an operator;
• a movable unit comprising a loosely fitted space inside, a main body supporting the operation part and comprising a first loosely fitted surface exposed in the loosely fitted space, and at least one drive magnet;
• a fixed unit comprising 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 comprising 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, the drive part comprising the at least one drive magnet and the at least one drive coil;
• and
• a detector to detect a position of the operation part in the fixed unit,
• wherein one of the first loosely fitted surface and the second loosely fitted surface comprises an inner peripheral surface formed into a recessed portion, and another one of the first loosely fitted surface and the second loosely fitted surface comprises at least one protruded spherical surface.