This device for the simultaneous zero-resetting of two counters, the pivot axes of which are fixedly connected to respective heart-shaped zero-resetting cams ( 7, 8 ), comprises a zero-resetting lever ( 2 ) containing two hammers ( 6 c, 6 d), means ( 5 ) for exerting upon this lever ( 2 ) a torque for pressing the two hammers ( 6 c, 6 d) against the zero-resetting cams ( 7, 8 ), and articulation means ( 2 d, 2 e, 6 a, 6 b) for articulating these hammers relative to the lever ( 2 ). These articulation means comprise two pins ( 2 d, 2 e), one of which ( 2 d) is engaged in a guide slot with limited amplitude ( 6 a), orientated in order that the direction of the perpendicular, dropped from the axis of the pin ( 2 d) onto this guide slot ( 6 a), intersects the straight line joining the axes ( 7 a, 8 a) of the zero-resetting cams ( 7, 8 ) at a point capable of improving the distribution of the torque transmitted to these cams ( 7, 8 ).