A digit mechanism for an artificial hand comprises: a lower digit (44) arranged to be rotatably coupled to a palm unit (12) of the artificial hand； an upper digit (48) rotatably coupled to the lower digit (44)； a lower digit rotation mechanism (34, 46, 52, 58) for applying a moment to the lower digit (44) to rotate the lower digit (44) relative to the palm unit (12)； an upper digit rotation mechanism (50, 54, 56) for applying a moment to the upper digit (48) to rotate the upper digit (48) relative to the lower digit (44)； and a force balancing mechanism (60, 58) for mechanically adjusting the magnitude of the moment applied by the lower digit rotation mechanism (34, 46, 52, 58) and/or the upper digit rotation mechanism (50, 54, 56) in accordance with the magnitude(s) of outside forces resisting rotation of the upper digit (48) and/or the lower digit (44) in order to preferentially apply movement to the digit experiencing lower resistance to movement； wherein the force balancing mechanism is arranged to increase the force applied to rotate a controlled digit when a controlling digit experiences a greater resistance to movement than the controlled digit, and decrease the force applied to rotate the controlled digit when the controlling digit experiences a lesser resistance to movement than the controlled digit； wherein the lower digit rotation mechanism (34, 46, 52, 58) and upper digit rotation mechanism (50, 54, 56) are arranged to be mechanically actuated, in use, by a force applied from a single actuator at the palm unit (12).
