Folding three-piece scooter, with front (r) and rear (r') retractable wheels, comprising a three-piece base, namely a central portion (a), in which are longitudinally formed two consecutive median oblong openings (m, n), - connected by a bottom hinge (h) to a front lateral portion (b), also called front lateral plate (b); - connected by a bottom hinge (h') to a rear lateral portion (c), also called rear lateral plate (c), vertically incorporating the rear wheel (r') with its axle formed with a brake (s), - connected by a bottom hinge (h') to a rear side part (c) - the two oblong openings (m, n) being intended to allow partial retraction of the wheels (r, r') therein when the lower faces of the front lateral portion (b) and of the rear lateral portion (c) are folded down flat in hinges on the inner face of the central portion (a), characterized in that the front lateral portion (b) is formed with a circular opening serving as bearing cage, horizontally and perimetrically integrating, midway through the thickness of the front lateral portion (b), a skirt whereof the opposite crowns (E, F) symmetrically support, rotatably captive, two identical circular assemblies in flat contact, each rotating on a bearing with a horizontal function on the opposite crowns (E, F), these two assemblies vertically incorporating between them the front wheel (r) with its axle, and supporting fixed on either side of the front wheel (r), the arms of a saddle (d), lower portion of the steering column of the scooter, centrally and vertically topped by a tube made up of a fixed portion (e) and a telescoping portion (f) sliding in the fixed portion (e), central portion of the steering column whereof the upper portion is the handlebars (g) secured to the telescoping portion (f) in the middle thereof, - the central portion (a) and the front lateral portion (b), on the one hand, and the central portion (a) and the rear lateral portion (c), on the other hand being maintained in a fixed coplanar connection by a set of two pairs of toggles (z1, z2; z3, z4) on the one hand, each pair or toggles (z1, z2; z3, z4) being able to be connected by a shared active lever (j) for one pair or toggles (z1, z2) and (j') for the other pair or toggles (z3, z4); - the bottom hinges (h, h') being protected from shearing by the provision on the two hinge edges of the central portion (a) of protuberances (L, L'; R, R'), which fit into the corresponding female openings on the edges of the front lateral portion (b) and the rear lateral portion (c); - the hinge edges between the central portion (a) and the front lateral portion (b), on the one hand, and between the central portion (a) and the rear lateral portion (c), on the other hand, as well as, at these hinge edges, the female openings for fitting the protuberances (L, L'), are formed with Silentblocs making it possible both to eliminate friction noises and make the connecting structures between the bases more flexible. - connected by a bottom hinge (h) to a front lateral portion (b), also called front lateral plate (b); - connected by a bottom hinge (h') to a rear lateral portion (c), also called rear lateral plate (c), vertically incorporating the rear wheel (r') with its axle formed with a brake (s), - connected by a bottom hinge (h') to a rear side part (c) - the two oblong openings (m, n) being intended to allow partial retraction of the wheels (r, r') therein when the lower faces of the front lateral portion (b) and of the rear lateral portion (c) are folded down flat in hinges on the inner face of the central portion (a), characterized in that the front lateral portion (b) is formed with a circular opening serving as bearing cage, horizontally and perimetrically integrating, midway through the thickness of the front lateral portion (b), a skirt whereof the opposite crowns (E, F) symmetrically support, rotatably captive, two identical circular assemblies in flat contact, each rotating on a bearing with a horizontal function on the opposite crowns (E, F), these two assemblies vertically incorporating between them the front wheel (r) with its axle, and supporting fixed on either side of the front wheel (r), the arms of a saddle (d), lower portion of the steering column of the scooter, centrally and vertically topped by a tube made up of a fixed portion (e) and a telescoping portion (f) sliding in the fixed portion (e), central portion of the steering column whereof the upper portion is the handlebars (g) secured to the telescoping portion (f) in the middle thereof, - the central portion (a) and the front lateral portion (b), on the one hand, and the central portion (a) and the rear lateral portion (c), on the other hand being maintained in a fixed coplanar connection by a set of two pairs of toggles (z1, z2; z3, z4) on the one hand, each pair or toggles (z1, z2; z3, z4) being able to be connected by a shared active lever (j) for one pair or toggles (z1, z2) and (j') for the other pair or toggles (z3, z4); - the bottom hinges (h, h') being protected from shearing by the provision on the two hinge edges of the central portion (a) of protuberances (L, L'; R, R'), which fit into the corresponding female openings on the edges of the front lateral portion (b) and the rear lateral portion (c); - the hinge edges between the central portion (a) and the front lateral portion (b), on the one hand, and between the central portion (a) and the rear lateral portion (c), on the other hand, as well as, at these hinge edges, the female openings for fitting the protuberances (L, L'), are formed with Silentblocs making it possible both to eliminate friction noises and make the connecting structures between the bases more flexible.