A tractor mower (100) is described comprising a cutting housing (1) partially closed downwards by a lower wall (18) which opens downwards only at a cutting chamber (10) which comprises a left side cavity (30), a right side cavity (40) and an upper central cavity (20), said cutting chamber (10) mounting two cutting blades (5) with a left side vertical hub (3) identifying a left side vertical axis (V) and with a right side vertical hub (4) identifying a right side vertical axis (W), the left side vertical axis (V) being shifted towards a front portion (102) of the tractor mower (100) with respect to the right side vertical axis (W), with reference to a longitudinal axis (L) of the tractor mower (100).
