A direct-drive wind turbine comprising an external rotor (1) having an external anular body (1a) and a stator (3), a nacelle (6) which is mounted on an upper part of a tower (7) and which houses a shaft-holder mechanism (8) for supporting the horizontal shaft (5), a plurality of blade-holder structures (9) arranged equidistantly on external peripheral portions of the external anular body (1a), and a blade root (10a) connected to the blade-holder structure (9), said turbine also including a distal end part (12c) connected to the blade root (10a), a lateral hatch (13) for accessing an internal chamber (12e) in the balde extender (1) and a door (14) for closing the hatch (13).