An electronics instrument 1 includes an instrument body, an operation display unit and a driving mechanism. The driving mechanism moves the operation display unit over the span between a first position where the insertion inlet of the instrument body is covered and a second position where the insertion inlet is opened. The driving mechanism is provided with a helical torsion coil spring 30. At the first position, the helical torsion coil spring 30 urges the operation display unit toward the second position. At the second position, the helical torsion coil spring 30 urges the operation display unit toward the first position. This configuration suppresses the sound generated when the operation display unit of a cover is located at a first position where the one surface of the instrument body is covered and a second position where at least a part of the one surface is opened.