Crystal unit and holding structure of crystal unit

A crystal unit, comprising:

• a crystal blank having a hole portion defined in at least one principal surface thereof, providing a vibrating region in a portion of the crystal blank which is made thinner by the hole portion;
• excitation electrodes disposed respectively on opposite principal surfaces of the crystal blank in said vibrating region;
• extension electrodes extending respectively from said excitation electrodes to respective first and second positions on an outer peripheral portion of said crystal blank;
• a casing;
• and
• a pillow member mounted on said casing,
• wherein said crystal blank has a single fixed end electrically and mechanically connected to said casing by eutectic alloy in said first position,
• wherein said crystal blank has a free end in said second position, said free end being placed on said pillow member, and
• wherein said extension electrodes are electrically connected to said casing by wire bonding in said second position.