A prosthetic finger comprising - an attachment adapted to constrain said prosthetic finger to an external body; - a phalanx proximal to said attachment and a phalanx distal to said attachment; - said proximal phalanx being hinged to said attachment, defining a first axis of rotation; - said distal phalanx being hinged to said proximal phalanx on the opposite side of said attachment, defining a second axis of rotation; - at least one actuator adapted to control a rotation of said phalanges (31, 32); - at least one control cable (5a, 5b) defining a control end constrained to said distal phalanx and adapted to control said rotation of said phalanges (31, 32) in a first direction; and for each prosthetic finger (3, 3a); - a return cable defining a first return end constrained to said attachment and a second return end constrained to said distal phalanx; said return cable being on the opposite side of said control cable with respect to said axes of rotation (31a, 32a); - an elastic body adapted to keep said return cable under tension and to work in opposition to said control cable (5a, 5b), so that when said control cable (5a, 5b) rotates said phalanges (31, 32) in said first direction, it moves said return cable, thereby loading said elastic body and allowing said elastic body to control a rotation of said phalanges (31, 32) in a second direction opposite to said first direction; and characterised in that - said prosthetic finger (3, 3a) comprises channels for housing said cables (5a, 5b, 341) formed in said phalanges (31, 32); and - said prosthetic finger comprises first pins for the sliding of said control cable (5a, 5b), and second pins for the sliding of the return cable; and wherein said first pins are positioned so that said control cable (5a, 5b) defines a torque on said first axis of rotation greater than the torque on said second axis of rotation. - an attachment adapted to constrain said prosthetic finger to an external body; - a phalanx proximal to said attachment and a phalanx distal to said attachment; - said proximal phalanx being hinged to said attachment, defining a first axis of rotation; - said distal phalanx being hinged to said proximal phalanx on the opposite side of said attachment, defining a second axis of rotation; - at least one actuator adapted to control a rotation of said phalanges (31, 32); - at least one control cable (5a, 5b) defining a control end constrained to said distal phalanx and adapted to control said rotation of said phalanges (31, 32) in a first direction; and for each prosthetic finger (3, 3a); - a return cable defining a first return end constrained to said attachment and a second return end constrained to said distal phalanx; said return cable being on the opposite side of said control cable with respect to said axes of rotation (31a, 32a); - an elastic body adapted to keep said return cable under tension and to work in opposition to said control cable (5a, 5b), so that when said control cable (5a, 5b) rotates said phalanges (31, 32) in said first direction, it moves said return cable, thereby loading said elastic body and allowing said elastic body to control a rotation of said phalanges (31, 32) in a second direction opposite to said first direction; and characterised in that - said prosthetic finger (3, 3a) comprises channels for housing said cables (5a, 5b, 341) formed in said phalanges (31, 32); and - said prosthetic finger comprises first pins for the sliding of said control cable (5a, 5b), and second pins for the sliding of the return cable; and wherein said first pins are positioned so that said control cable (5a, 5b) defines a torque on said first axis of rotation greater than the torque on said second axis of rotation.