A piezoelectric resonator suitable to be mounted on a support, including a first planar tuning-fork shaped part and a second planar tuning-fork shaped part arranged side by side in a common plane, and further including a linking part arranged to link the first and second tuning-fork shaped parts together, the first and the second tuning-fork shaped parts each having an inner vibrating arm (25a, 25b) with a first end linked to the linking part, an outer vibrating arm (23a, 23b) with a first end free to move, and a cross portion (27a, 27b) linked to a second end of the inner vibrating arm and a second end of the outer vibrating arm, the inner and the outer vibrating arms of each tuning-fork shaped part extending from the respective cross portion, substantially parallel to each other, and carrying electrodes arranged to make the inner and the outer vibrating arms oscillate, the electrodes being connected to connection pads (51, 52), the inner vibrating arm of the first tuning-fork shaped part and the inner vibrating arm of the second tuning-fork shaped part further being arranged side by side, substantially parallel to each other and on either side of an axis of symmetry with the linking part located in the center, the linking part extending between the first ends of the inner vibrating arms (25a, 25b) so as to join the first ends together, the piezoelectric resonator being suitable to be mounted on the support via the linking part, and the electrodes carried by the first and second tuning-fork shaped parts being interconnected through the linking part so as to make the inner vibrating arms of the first and second tuning-fork shaped parts oscillate with opposite phase, when the inner vibrating arms (25a, 25b) are bending, characterized in that a central arm is attached to the linking part and is located between the inner vibrating arms (25a, 25b), substantially equidistant from these arms, and in that the electrodes carried by the inner and the outer vibrating arms are interconnected through the cross portions (27a, 27b) of the first and the second tuning-fork shaped parts respectively, in such a way as to make the first end of the outer vibrating arm of each of the tuning-fork shaped parts oscillate with opposite phase to the inner vibrating arm, when the inner and outer vibrating arms of each planar tuning-fork shaped part are bending, and, wherein each of the vibrating arms has an upper main surface and a lower main surface and two side surfaces extending between the upper and the lower main surfaces, wherein the electrodes comprise central electrodes disposed on the upper and lower main surfaces of the vibrating arms, and lateral electrodes disposed on side surfaces of the vibrating arms, wherein the central electrodes disposed on the outer vibrating arm of the first tuning-fork shaped part are connected to the lateral electrodes disposed on the inner vibrating arm of the same tuning-fork shaped part, to the central electrodes disposed in the inner vibrating arm of the second tuning-fork shaped part, and to the lateral electrodes disposed on the outer vibrating arm of the second tuning-fork shaped part, and wherein the central electrodes disposed on the outer vibrating arm of the second tuning-fork shaped part are connected to the lateral electrodes disposed on the inner vibrating arm of the same tuning-fork shaped part, to the central electrodes disposed on the inner vibrating arm of the first tuning-fork shaped part, and to the lateral electrodes disposed on the outer vibrating arm of the first tuning-fork shaped part.