An aircraft wing comprising a fixed wing centre body, as well as at least one mobile leading edge flap for being moved relative to said fixed centre body between an extended position and a retracted position, the fixed wing centre body comprising a front spar delimiting a wing box at the front of which said mobile flap is located, the latter being associated with at least one guiding device for guiding it with respect to the fixed wing centre body, the guiding device being totally arranged at the front of the front spar of the wing box, this device including the following elements: - a first pivoting member having a first end connected to the front spar of the wing box through a first hinged connection; - a second pivoting member connected to a second end of the first pivoting member through a second hinged connection arranged between a first and a second end (44a, 44b) of the second pivoting member, the first end of this second pivoting member being connected to a module for connecting the mobile flap through a third hinged connection; and - a guiding rail integral with the front spar of the wing box, the guiding rail receiving a follower member arranged at the second end of the second pivoting member, characterized in that the guiding rail defines a trajectory lying on the surface of a dummy sphere, and in that the hinging axes (54, 54b, 54c) of the three hinged connections converge to a same point corresponding to the centre of the dummy sphere. the guiding device being totally arranged at the front of the front spar of the wing box, this device including the following elements: - a first pivoting member having a first end connected to the front spar of the wing box through a first hinged connection; - a second pivoting member connected to a second end of the first pivoting member through a second hinged connection arranged between a first and a second end (44a, 44b) of the second pivoting member, the first end of this second pivoting member being connected to a module for connecting the mobile flap through a third hinged connection; and - a guiding rail integral with the front spar of the wing box, the guiding rail receiving a follower member arranged at the second end of the second pivoting member, characterized in that the guiding rail defines a trajectory lying on the surface of a dummy sphere, - a first pivoting member having a first end connected to the front spar of the wing box through a first hinged connection; - a second pivoting member connected to a second end of the first pivoting member through a second hinged connection arranged between a first and a second end (44a, 44b) of the second pivoting member, the first end of this second pivoting member being connected to a module for connecting the mobile flap through a third hinged connection; and - a guiding rail integral with the front spar of the wing box, the guiding rail receiving a follower member arranged at the second end of the second pivoting member, characterized in that the guiding rail defines a trajectory lying on the surface of a dummy sphere, and in that the hinging axes (54, 54b, 54c) of the three hinged connections converge to a same point corresponding to the centre of the dummy sphere.