An operation input device provided in a vehicle and operated by a hand or a finger of a driver to carry out an input according to a movement amount of the hand or the finger of the driver is provided. The operation input device includes a time series signal generator that detects the movement amount and generates a time series signal of the movement amount, an input operation accepter that accepts an input operation of the driver based on the time series signal, and a band attenuation filter that is provided between the time series signal generator and the input operation accepter and attenuates, of signal components of the time series signal, a signal component from a predetermined first frequency to a predetermined second frequency larger than the first frequency.