A humanoid electric hand includes a metacarpophalangeal joint and an interphalangeal joint. The interphalangeal joint bends or extends together with a bending or extending operation of the metacarpophalangeal joint, by linking a finger motor for driving a finger to a worm deceleration mechanism, an output gear of which moves rotationally to bend or extend the metacarpophalangeal joint, and by linking the metacarpophalangeal joint to the interphalangeal joint via a link mechanism.