A hinge unit for hopper/awning window units (1), the window unit comprising a fixed frame (2) and a sash (3) capable of rototranslation between open and closed positions. The hinge units (4) each comprise: a supporting element (5) integral with the fixed frame (2); an arm (6) one end of which pivots at the sash (3); a first slide (7) slidable along the supporting element (5); connecting rods (8, 9) connecting the first slide (7) to the arm (6); a joint rod (10) between the arm (6) and the supporting element (5), its ends respectively pivoting at a distal point of the supporting element (5) and at the arm (6), so as to form a second connecting point (F2); there being adjusting means (11) to allow a variation of the connecting point (F2) along the supporting element (5).