The invention relates to a monobloc device (40) for supporting a motor vehicle powerplant (10), which comprises: – a support arm (42); a fixing mount (44) which is arranged at a first end of the support arm (42) and which is intended to be fixed rigidly to the powerplant (10); and – a suspension annulus (48) of determined main axis (A), which is arranged at a second end of the support arm (42) and which is intended to be fixed to a structural element (38) of the vehicle with the interposition of a damping ring (50); characterized in that the support arm (42) comprises a connecting-shaft bearing (52) through which a transmission shaft (22) of the powerplant (10) is intended to pass intended to support said shaft.
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