A side stabilizer (1) for agricultural machines comprising: a hollow body (2) open at one extremity (2a) and closed at the opposite extremity (2b) which is associable with the structure of an agricultural machine, a cylindrical element (3) fitted sliding inside the hollow body (2) along a direction of translation (4) and associable with the lower arm (B) of a three-point linkage, at least one locator element (5) fitted tight and mobile inside the hollow body (2) and the position of which is adjustable in a fluid-dynamic manner to adjust the end-of-stroke position of the cylindrical element (3) along at least one sense of the direction of translation (4), protection means (9) of the locator element (5) placed between said hollow body (2) and the cylindrical element (3) so as to define a substantially closed chamber (30) inside which the locator element itself is contained, wherein the protection means (9) comprise at least a protection element having a substantially tubular conformation and fitted the said cylindrical element (3) and where the protection element (9) is integrally associated with the hollow body (2).
