A compact geared reduction unit comprising: a box-like body, a gear system accommodated inside said box-like body, a driving shaft, a transmission shaft, said transmission shaft having an end portion that protrudes outside said box-like body in an axial direction of said transmission shaft so as to be adapted to transmit motion to a unit to be actuated rotationally, an output reduction stage of the epicyclic type of the gear system which comprises: a driving sun gear which rotates about a main axis; a ring gear which is integrally associated with said box-like body; multiple planet gears which are engaged between said driving sun gear and said ring gear and which are supported in rotation about respective longitudinal axes which are parallel to said main axis; and a transmission planet carrier, which supports in rotation said multiple planet gears and which in turn rotates about said main axis and is connected so as to be integral in rotation with said transmission shaft at a connection region such that rotary motion is transmitted from said driving shaft to said transmission shaft, the reduction unit further comprising rolling means comprising a first radial bearing which is arranged interposed in a radial direction between said box-like body and said planet carrier and a second radial bearing which is arranged interposed radially between said box-like body and said transmission shaft, the first and second radial bearings (15, 16) being arranged axially on opposite sides of said connection region such that said rolling means being adapted to support cantilevered radial loads subjected to said transmission shaft by a reaction of a coupling of said end portion of said transmission shaft protruding outside said box-like body to said unit to be actuated rotationally for the rotational guiding of said transmission shaft. a box-like body, a gear system accommodated inside said box-like body, a driving shaft, a transmission shaft, said transmission shaft having an end portion that protrudes outside said box-like body in an axial direction of said transmission shaft so as to be adapted to transmit motion to a unit to be actuated rotationally, an output reduction stage of the epicyclic type of the gear system which comprises: a driving sun gear which rotates about a main axis; a ring gear which is integrally associated with said box-like body; multiple planet gears which are engaged between said driving sun gear and said ring gear and which are supported in rotation about respective longitudinal axes which are parallel to said main axis; and a transmission planet carrier, which supports in rotation said multiple planet gears and which in turn rotates about said main axis and is connected so as to be integral in rotation with said transmission shaft at a connection region such that rotary motion is transmitted from said driving shaft to said transmission shaft, the reduction unit further comprising rolling means comprising a first radial bearing which is arranged interposed in a radial direction between said box-like body and said planet carrier and a second radial bearing which is arranged interposed radially between said box-like body and said transmission shaft, the first and second radial bearings (15, 16) being arranged axially on opposite sides of said connection region such that said rolling means being adapted to support cantilevered radial loads subjected to said transmission shaft by a reaction of a coupling of said end portion of said transmission shaft protruding outside said box-like body to said unit to be actuated rotationally for the rotational guiding of said transmission shaft.