A tuning device includes a pitch extraction device with which the pitch of
an input signal is extracted and a deviation detection device with which
the deviation of the pitch that has been extracted by the pitch
extraction device from a standard pitch is detected. The deviation that
has been detected by the deviation detection device is displayed by an
indicator of a mechanical meter. The tuning device also includes an
ultrasonic motor that drives the indicator. A controller drives the
ultrasonic motor in conformance with the deviation that has been detected
by the deviation detection device. The controller, by driving the
indicator using the ultrasonic motor, arranges the indicator in the
standard position in those cases where the deviation that has been
detected by the deviation detection device is zero, and moves the
indicator up to a position in the positive direction that corresponds to
the deviation in those cases where the deviation is a positive value and
moves the indicator up to a position in the negative direction that
corresponds to the deviation in those cases where the deviation is a
negative value.