Installation of ceiling finish boards, which involves the handling of heavy gypsum boards performed on scaffold, is a laborious and dangerous work. An interior finish work robot capable of installing gypsum boards automatically was developed 1989 to relieve workers of such a dangerous, hard work. The developed interior finished work robot installs sub ceiling boards to double layered ceilings. The tasks the robot performs are to hold, lift, position, and screw gypsum bolts on to light-weight steel frames, while travelling along the base line. This paper describe the functions of this robot and results of experiments conducted at several construction sites.