Control element 1 for a lock fitting 2 comprising: - a base 8 extending along an attachment plane 9 applied to a door or window type of joinery 3; - a control handle 11 which is pivotally mounted on said base 8 about an axis 10 perpendicular to said attachment plane 9 for rotating an operating element 12 defined so as to be capable of acting on a lock fitting mechanism 2; - and a gear reduction transmission mechanism 13 cooperating with said control handle 11 and with the operating element 12; - said control handle 11 being mounted on the base 8 so as to be freely rotatable about a middle position 14 in a first direction of rotation D1 and in a second opposite direction D2 for rotational control of the operating element 12, respectively, in said first direction D1 and in said second opposite direction of rotation D2 via said gear reduction transmission mechanism 13; characterized in that: • the gear reduction transmission mechanism 13 is of the type having an epicyclic gear train 16 positioned in a housing 17 which the base 8 comprises and which closes on an attachment plate 18; • and the operating element 12 and control handle 11 are coaxial, the operating element 12 comprising an end 22 extending into the housing 17 and supporting a toothed wheel corresponding to the sun gear 23 of the epicyclic gear train 16, at least one planet gear 24 having an axis 25 which is parallel to the axis 20 of the sun gear 23 meshing with the sun gear 23 and being rigidly connected to a planet carrier 26 supported by the control handle 11, one end 27 of which extends into the housing 17 of the base 8 in which a toothed ring 28 interlocked with the planet gear(s) 24 is also fixedly mounted. - a base 8 extending along an attachment plane 9 applied to a door or window type of joinery 3; - a control handle 11 which is pivotally mounted on said base 8 about an axis 10 perpendicular to said attachment plane 9 for rotating an operating element 12 defined so as to be capable of acting on a lock fitting mechanism 2; - and a gear reduction transmission mechanism 13 cooperating with said control handle 11 and with the operating element 12; - said control handle 11 being mounted on the base 8 so as to be freely rotatable about a middle position 14 in a first direction of rotation D1 and in a second opposite direction D2 for rotational control of the operating element 12, respectively, in said first direction D1 and in said second opposite direction of rotation D2 via said gear reduction transmission mechanism 13; • the gear reduction transmission mechanism 13 is of the type having an epicyclic gear train 16 positioned in a housing 17 which the base 8 comprises and which closes on an attachment plate 18; • and the operating element 12 and control handle 11 are coaxial, the operating element 12 comprising an end 22 extending into the housing 17 and supporting a toothed wheel corresponding to the sun gear 23 of the epicyclic gear train 16, at least one planet gear 24 having an axis 25 which is parallel to the axis 20 of the sun gear 23 meshing with the sun gear 23 and being rigidly connected to a planet carrier 26 supported by the control handle 11, one end 27 of which extends into the housing 17 of the base 8 in which a toothed ring 28 interlocked with the planet gear(s) 24 is also fixedly mounted.