A force-feedback input device includes an operating unit manipulated by an operator,
a detecting unit for detecting the operational state of the operating unit, a force-feedback
unit for providing a force feedback to the operating unit, and a controlling unit
for controlling the operation of the force-feedback unit to provide a predetermined
force feedback according to the operational state of the operating unit to the
operating unit. The controlling unit includes an operational-state-calculating
subunit, a returning-force-calculating subunit, a damping-force-calculating subunit,
and a resultant-force-calculating subunit. The damping-force-calculating subunit
calculates the damping coefficient by multiplying a returning force calculated
in the returning-force-calculating subunit by the required proportionality coefficient
and then calculates a damping force by multiplying the obtained damping coefficient
by an operation speed of the operating unit.