A support base (1, 1') for a tilting seat, such as a stool, a chair or an armchair, comprising: - a coupling body (50, 50') provided with a rod seat (52, 52') for engagement with a piston rod (S, S') of the seat; - a support body (2, 2') having a central portion (2a, 2a') provided with a passage (8, 8') with a main axis; - a plurality of flexible components (20, 20'), structurally separable and elastically yielding, each made in a single piece, arranged circumferentially around the coupling body (50, 50'), arranged between the coupling body (50, 50') and the central portion (2a, 2a'), suitable to meet in compression according to the oscillations of the piston rod (S, S'), wherein each flexible component (20, 20') comprises a first elastically yielding block (22, 22'), a second elastically yielding block (32, 32') that is axially spaced apart from the first block (22, 22'), and a connection portion (40, 40') that connects said blocks (22, 22'; 32, 32'), and wherein the central portion comprises a protrusion that projects radially internally in the passage or the coupling body comprises a flange that projects radially externally, wherein each flexible component is attached to the protrusion of the central portion or each flexible component is attached to the flange of the coupling body; and wherein the first block (22, 22') of each flexible component (20, 20') is arranged above the protrusion or the flange and the second block (32, 32') of each flexible component (20, 20') is arranged below the protrusion or the flange. - a coupling body (50, 50') provided with a rod seat (52, 52') for engagement with a piston rod (S, S') of the seat; - a support body (2, 2') having a central portion (2a, 2a') provided with a passage (8, 8') with a main axis; - a plurality of flexible components (20, 20'), structurally separable and elastically yielding, each made in a single piece, arranged circumferentially around the coupling body (50, 50'), arranged between the coupling body (50, 50') and the central portion (2a, 2a'), suitable to meet in compression according to the oscillations of the piston rod (S, S'), wherein each flexible component (20, 20') comprises a first elastically yielding block (22, 22'), a second elastically yielding block (32, 32') that is axially spaced apart from the first block (22, 22'), and a connection portion (40, 40') that connects said blocks (22, 22'; 32, 32'), and wherein the central portion comprises a protrusion that projects radially internally in the passage or the coupling body comprises a flange that projects radially externally, wherein each flexible component is attached to the protrusion of the central portion or each flexible component is attached to the flange of the coupling body; and wherein the first block (22, 22') of each flexible component (20, 20') is arranged above the protrusion or the flange and the second block (32, 32') of each flexible component (20, 20') is arranged below the protrusion or the flange. and wherein the central portion comprises a protrusion that projects radially internally in the passage or the coupling body comprises a flange that projects radially externally, wherein each flexible component is attached to the protrusion of the central portion or each flexible component is attached to the flange of the coupling body; and wherein the first block (22, 22') of each flexible component (20, 20') is arranged above the protrusion or the flange and the second block (32, 32') of each flexible component (20, 20') is arranged below the protrusion or the flange.