To realize a robot device and its control method expressing emotion with a simple constitution.

An eyelid opening-closing part 80 having an eyelid vertically divided into two parts, is arranged in front of an eyeball part 72 having the imaging function. Various expressions are expressed by freely changing an opening-closing quantity and an inclination of the eyelid by rotatingly driving the eyelid opening-closing part 80 by a eyelid rotating part 90 arranged in the rear of the eyeball part 72, and the whole expression expressing mechanism is simplified and downsized.