Musical instrument tuner, musical performance support device and musical instrument management device

A musical instrument tuner comprising:

• a sensor device that is attached to a musical instrument;
• and
• an operation device that is able to perform wireless communication mutually with the sensor device,
• wherein the sensor device includes:
• an acceleration sensor that has at least two detection axes,
• frequency detection means for detecting, as a detected frequency, a frequency of a vibration of musical sound generated through an operation of the musical instrument based on a strongest output signal from among output signals of the at least two detection axes of the acceleration sensor or a synthesized value of the output signals of the at least two detection axes of the acceleration sensor, and
• sensor-side communication means for transmitting transmission information including information regarding the detected frequency to the operation device, and
• the operation device includes:
• operation-side communication means for receiving the transmission information transmitted from the sensor device,
• display means, and
• control means for generating timing information of the musical instrument and causing the display means to display the tuning information based on the transmission information received from the sensor device.