Lawnmower comprising a quick fastening means between a front portion of the lawnmower and a frontal implement of the lawnmower, said frontal implement is separably mountable with the front portion of the lawnmower, said quick fastening means comprise a first portion and a second portion, said first portion of the quick fastening means is rotatably associated with the front portion of the lawnmower identifying a rotation axis, said second portion of the quick fastening means is fixed with the frontal implement of the lawnmower, said first portion of the quick fastening means comprise a rotating portion, at least one bracket (401, 402), a hub, an extension, said rotating portion of the first portion of the quick fastening means is a folded sheet with a transversal section of U-shape and comprises an outer sheet and an inner sheet that are parallel to each other and a transversal sheet which is a spacer between the outer sheet and the inner sheet, said rotating portion comprises an engaging pivot which is transversely disposed between the outer sheet and the inner sheet of the rotating portion along a roto-translation axis which is parallel with the rotation axis, said roto-translation axis is arranged to a longitudinal distance with respect to the rotation axis, said second portion of the quick fastening means comprises a first extremity integrally fixed to the frontal implement of the lawnmower and a second extremity which comprises a locking notch and an extension which extends towards the back of the lawnmower along a longitudinal axis, said second extremity of the second portion of the quick fastening means is separably and quickly mountable with the first portion of the quick fastening means, the extension comprises a hook slot of U-shape facing downwards along the vertical axis, said hook slot is adapted to be separably and rotatably associated with an outer surface of the engaging pivot of the rotating portion, the locking notch is disposed in a direction opposed to the extension comprising the hook slot, said hub of the first portion of the quick fastening means is firmly welded with the rotating portion by means of said at least one bracket (401, 402), said hub comprises a transversal through hole which is disposed along the direction of the rotation axis and is adapted to engage said axis of the front wheel of the lawnmower, said extension extends from the rotating portion towards the direction of the longitudinal axis, the first portion of the quick fastening means rotates about the rotation axis passing from a disengagement position which permits the disengagement of the second portion to an engagement position which does not permit the disengagement of the second portion, during a rotation of the first portion of the quick fastening means about the rotation axis the engaging pivot rotates about the rotation axis in its turn, characterized in that said first portion of the quick fastening means comprises a lever and a recall spring, said lever is pivoted with the rotating portion by means of a hinge pivot of the first portion, the lever comprises an elongated portion which overlaps for at least a portion to the extension of the rotating portion, the rotational movement of the lever rotating about the hinge pivot is constrained by the elongated portion adapted to enter in contact with the extension of the rotating portion, the rotating portion comprises at least one constraint slit which is of circumference arc shape, a constraint pivot of the first portion engages the lever and the constraint slit of the rotating portion constraining the rotational movement of the lever within the circumference arc identified by the constraint slit of the rotating portion, the constraint pivot is adapted to enter the locking notch of the second portion of the quick fastening means when the constraint pivot is at a first position inside the constraint slit, said recall spring keeps in place the constraint pivot at the first position inside the constraint slit.