The present invention relates to a light guide device for the introduction of sunlight into the interior of a building, having a multitude of movably mounted light deflection surfaces which are adjustable by control means depending on the position of the sun. According to the present invention the light deflecting surfaces of the light guide device are formed by serially arranged deflecting blades which may be swiveled about swivel axes which are approximately parallel to each other, the blades being mounted on a blade holder which is rotatable about a rotational axis which is essentially perpendicular to the direction of the swivel axes.