A vibratory gyroscope sensor comprising: - a base, - a resonator that includes a central foot by which the resonator is attached to said base and a sidewall that rises from said foot up to a free end edge delimiting an opening, said sidewall comprising a proximal portion that rises from and around said foot as well as a distal portion generally cylindrical in shape that extends in line with said proximal portion up to said free end edge, said proximal portion progressively widening from the foot towards the distal portion, the sensor being characterized in that said proximal portion includes a plurality of arms (6, 7, 8, 9, 10, 11, 12, 13) separated from each other by clear spaces and arranged equiangularly around said foot, each of said arms (6, 7, 8, 9, 10, 11, 12, 13) extending longitudinally between a central end arranged on the side of the foot and a peripheral end arranged on the side of the distal portion, said sensor comprising a plurality of excitation devices attached to said proximal portion to excite said resonator into vibration, as well as a plurality of detection devices attached to said proximal portion to detect vibrations of said resonator, said excitation devices and said detection devices being attached to said arms (6, 7, 8, 9, 10, 11, 12, 13). - a base, - a resonator that includes a central foot by which the resonator is attached to said base and a sidewall that rises from said foot up to a free end edge delimiting an opening, said sidewall comprising a proximal portion that rises from and around said foot as well as a distal portion generally cylindrical in shape that extends in line with said proximal portion up to said free end edge, said proximal portion progressively widening from the foot towards the distal portion, the sensor being characterized in that said proximal portion includes a plurality of arms (6, 7, 8, 9, 10, 11, 12, 13) separated from each other by clear spaces and arranged equiangularly around said foot, each of said arms (6, 7, 8, 9, 10, 11, 12, 13) extending longitudinally between a central end arranged on the side of the foot and a peripheral end arranged on the side of the distal portion, said sensor comprising a plurality of excitation devices attached to said proximal portion to excite said resonator into vibration, as well as a plurality of detection devices attached to said proximal portion to detect vibrations of said resonator, said excitation devices and said detection devices being attached to said arms (6, 7, 8, 9, 10, 11, 12, 13). said sidewall comprising a proximal portion that rises from and around said foot as well as a distal portion generally cylindrical in shape that extends in line with said proximal portion up to said free end edge, said proximal portion progressively widening from the foot towards the distal portion, the sensor being characterized in that said proximal portion includes a plurality of arms (6, 7, 8, 9, 10, 11, 12, 13) separated from each other by clear spaces and arranged equiangularly around said foot, each of said arms (6, 7, 8, 9, 10, 11, 12, 13) extending longitudinally between a central end arranged on the side of the foot and a peripheral end arranged on the side of the distal portion, said sensor comprising a plurality of excitation devices attached to said proximal portion to excite said resonator into vibration, as well as a plurality of detection devices attached to said proximal portion to detect vibrations of said resonator, said excitation devices and said detection devices being attached to said arms (6, 7, 8, 9, 10, 11, 12, 13).