An acceleration-detecting type gyro apparatus comprising: a gyro case having a Z axis along the direction of a central axis, and X and Y axes perpendicular to the Z axis; a gyro rotor supported within the gyro case by electrostatic supporting force such that the gyro rotor is not in contact with the gyro case, and having a spin axis in said central axis direction; a plurality of electrostatic supporting electrodes (311-314, 321-324, 331-334, 341-344) spaced apart from the gyro rotor, and to which control voltages (±V 1A -±V 4D) are applied; a rotor drive system (315, 325, 160) for rotating the gyro rotor around said spin axis at high speed; a displacement-detection system (316, 326, 336, 346, 35) for detecting linear displacements in the X-axis, Y-axis, and Z-axis directions, and rotational displacements around the Y and X axes of said gyro rotor; and a restraining control system including a feedback loop for correcting said control voltages so that displacements detected by the displacement-detection system become zero; wherein: said gyro rotor is annular-shaped, and said electrostatic supporting electrodes are disposed in the manner of surrounding the gyro rotor; said gyro rotor is constituted to have a rectangular cross section formed of an upper surface, a lower surface, an inner circumference, and an outer circumference; said electrostatic supporting electrodes are provided in parallel to the upper surface, lower surface, inner circumference, and outer circumference of said gyro rotor; the acceleration-detecting type gyro apparatus characterized in that: said rotor drive system comprises a plurality of rotor-driving electrodes (315, 325) provided corresponding to the upper and lower surfaces of said gyro rotor; and wherein either: (iii) a plurality of concave portions are provided on the upper and lower surfaces of said gyro rotor; or (iv) a plurality of through holes for connecting the upper surface and the lower surface are provided in said gyro rotor; and land portions between the concave portions or the through holes are provided corresponding to said rotor-driving electrodes. a gyro case having a Z axis along the direction of a central axis, and X and Y axes perpendicular to the Z axis; a gyro rotor supported within the gyro case by electrostatic supporting force such that the gyro rotor is not in contact with the gyro case, and having a spin axis in said central axis direction; a plurality of electrostatic supporting electrodes (311-314, 321-324, 331-334, 341-344) spaced apart from the gyro rotor, and to which control voltages (±V 1A -±V 4D) are applied; a rotor drive system (315, 325, 160) for rotating the gyro rotor around said spin axis at high speed; a displacement-detection system (316, 326, 336, 346, 35) for detecting linear displacements in the X-axis, Y-axis, and Z-axis directions, and rotational displacements around the Y and X axes of said gyro rotor; and a restraining control system including a feedback loop for correcting said control voltages so that displacements detected by the displacement-detection system become zero; wherein: said gyro rotor is annular-shaped, and said electrostatic supporting electrodes are disposed in the manner of surrounding the gyro rotor; said gyro rotor is constituted to have a rectangular cross section formed of an upper surface, a lower surface, an inner circumference, and an outer circumference; said electrostatic supporting electrodes are provided in parallel to the upper surface, lower surface, inner circumference, and outer circumference of said gyro rotor; the acceleration-detecting type gyro apparatus characterized in that: said rotor drive system comprises a plurality of rotor-driving electrodes (315, 325) provided corresponding to the upper and lower surfaces of said gyro rotor; and wherein either: (iii) a plurality of concave portions are provided on the upper and lower surfaces of said gyro rotor; or (iv) a plurality of through holes for connecting the upper surface and the lower surface are provided in said gyro rotor; and land portions between the concave portions or the through holes are provided corresponding to said rotor-driving electrodes. (iii) a plurality of concave portions are provided on the upper and lower surfaces of said gyro rotor; or (iv) a plurality of through holes for connecting the upper surface and the lower surface are provided in said gyro rotor; and