A levelling device (10) accommodatable in a seat (12) provided for in a shoulder of a piece of furniture (13) comprises one foot element (14) adjustable in height by- means of a screw (15) and nut screw (16) adjustment mechanism, said screw (15) comprises a threaded shank (40) coupled to said nut screw (16) and a free end of the cylindrical head (11) shaped to constantly engage a complementarily shaped pinion element (17) actuatable to rotate said screw (15). According to the invention, said screw (15) and said pinion element (17) are enclosed inside a covering element (18, 20, 21, 22), and directly engaged to each other and thereto, projecting from the lower part of such covering element (18, 20, 21, 22) is said adjustable foot (14), wherein said free end of the shaped cylindrical head (11) comprises a plurality of shaped projections (19) facing a direction opposite to said threaded shank (40) arranged spaced peripherally one after the other along a peripheral circular rim above said free end of the head (11).
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