The invention is adapted to properly suppress noises of various frequency bands. An input unit (10) includes an acquiring element (11) for periodically acquiring signals from a load cell, so as to obtain time series signals; a plurality of frequency filters (121-123) for filtering the time series signals according to frequencies; and a transfer element (13) for transferring the signal filtered by at least one of the frequency filters (121-123) according to the frequency to a control device (90). The suppressed frequency bands of the frequency filters (121-123) are not repeated.