To provide a finger unit suitable to use for a robot hand precisely moving at a high speed.

This articulated finger unit 1 has a two joint structure furnished with a finger root side joint part 6, a finger root part 7, a fingertip side joint part 8 and a fingertip part 9, the finger root side joint part 6 has a driving side bevel gear 11 fixed on a rotary output shaft 4 of an actuator 3, a driven side bevel gear 15 coaxially fixed on a joint shaft 4 orthogonal with the rotary output shaft 4 and a connecting member 16 an annular boss 16a of which is connected to and fixed on this driven side bevel gear 15 and the head end side of which is extended in a foam type, and a finger root side cover 17 is connected to this connecting member 16. Rotation of the rotary output shaft 4 is converted to rotary motion of a joint shaft 14 through a pair of the bevel gears 11, 15, and the connecting member 16 one end of which is fixed on the joint shaft 14 is revolved to an angle of more than 90 degrees left and right around this joint shaft 14 as its center. It is possible to realize the articulated finger unit to move at high speed which can control to bend each of the joint parts 6, 8 in the longitudinal direction or left and right at an angle of more than 90 degrees.