part and a side of the supporting part the end portion includes a top surface and a side surface whereby the side surface is substantially perpendicular to the top surface and includes a circular arc shape disposed along a bottom portion thereof opposite to a junction of the top surface and the side surface application_number US 39284306 A description preferred embodiments of a gyro vibration piece a method of manufacturing the gyro vibration piece and a gyro sensor according to the present invention will be described with reference to the accompanying drawings a gyro vibration piece according to a first embodiment of the present invention will be described with reference to the accompanying drawings fig1 a is a plan view schematically illustrating a structure of a gyro vibration piece according to a first embodiment of the invention and fig1 b is a partially expanded view of q shown in fig1 a and a left side view thereof in the first embodiment a double t type gyro vibration piece will be described as an example of the gyro vibration piece as shown in fig1 a the gyro vibration piece 10 is formed of a crystal substrate as an example of a piezoelectric substrate crystal forming the crystal substrate has an x axis.