Displacement amount detecting apparatus and electronic wind instrument

An electronic wind instrument, comprising:

• an instrument main body;
• a blow port which is attached to one end of the instrument main body and has a cavity therein;
• a reed which is attached to the blow port and is configured to be displaceable toward the cavity when bitten by a performer;
• and
• a displacement amount detecting apparatus,
• wherein the displacement amount detecting apparatus comprises:
• a transmission member, configured to transmit a displacement on one end side thereof to a displacement on the other end side thereof, and the transmission member being configured to be rotatable around a predetermined axis with displacement of the reed when one end of the transmission member is brought into contact with the reed;
• a sensor, disposed to face the other end side of the transmission member, and configured to output a value according to a distance between the sensor and the other end side of the transmission member, and the sensor being disposed to face a detection unit on the other end side of the transmission member and measures a distance between the sensor and the detection unit, wherein when the reed is displaced due to being bitten by the performer, the detection unit of the transmission member rotates away from the sensor;
• a calculation device, configured to calculate a value for indicating the distance based on the value output by the sensor and a reference value;
• and
• a correction device, configured to correct the reference value,
• wherein when the one end side is displaced in a first direction, the other end side s displaced in a second direction opposite to the first direction and away from the sensor,
• the correction device is configured to correct the reference value based on the value for indicating the distance calculated by the calculation device.