A light adjustment system is, for example, a light adjustment window (1) including: a windowpane (11); a light adjustment device (40); a drive device (50); and a frame (20) having an incorporating (24) into which the windowpane (11) and the drive device (50) are incorporated. A part of the frame (20) includes: a containing section (26) that contains at least a part of the drive device (50); and an opening and closing section (27) that openably and closably covers the containing section (26).