A rotary harrow comprising: - an elongated box-shaped frame (10) including an elongated channel-shaped profile (12) having a bottom wall (18) and two lateral sides (20), - a plurality of soil working assemblies (30) carried by said elongated profile (12), wherein each of said soil working assemblies (30) comprises a support (32), a rotary shaft (42) rotatably carried by the support (32), a toothed wheel (46) fixed to one end of the rotary shaft (42) located within said elongated frame (10) and a tooth attachment device (50) fixed to a head (48) of said rotary shaft (42) located outside of said frame (10), wherein each of said supports (32) has a hollow portion (34) which extends partially inside said frame (10) and a radial flange (36) located outside the elongated frame (10) and fixed by means of screws (38) to the bottom wall (18) of the elongated profile (12), wherein the radial flange (36) of each support (32) has at least two extensions (54) that protrude in a transverse direction outwardly from the respective lateral sides (20), said extensions (54) being fixed to opposite lateral sides (20) of said elongated profile (12).
