Operation apparatus

An operation apparatus comprising:

• an operation plate that includes an operation surface, which is performed by a pressing operation through an operation body;
• a vibrator that includes
• a movable yoke and a fixed yoke that generate a magnetic circuit for guiding a magnetic flux,
• an exciting coil that generates the magnetic flux, and
• a vibrating elastic member that is initially deformed by a magnetic field generated by an electrical conduction on the exciting coil to vibrate the operation plate;
• a detector that detects a pressing amount, which is caused by the pressing operation;
• a microcomputer configured to
• determine whether the pressing operation is performed based on the pressing amount detected by the detector, and
• perform the electrical conduction on the exciting coil within a predetermined time from when the microcomputer determines that the pressing operation is performed;
• and
• a voltage application device that applies a detected voltage to the movable yoke,
• wherein the detector detects the pressing amount by detecting a change in an inductance of the exciting coil when the detected voltage is applied.