Abstract: Cover frames configure a slide cover. Each of the cover frames has, at a lower end thereof, a wiper that contacts an outer surface of the cover frame located immediate inside. Each of the cover frames also has, on an upper inner surface thereof, a roof-shaped backboard that extends over the cover frame inside. The backboard is provided slightly below an upper end of the cover frame. Each of the cover frames is provided, on an upper outer surface thereof, with a sliding shoe that contacts an inner surface of the cover frame located immediate outside. The innermost cover frame is fixed to a column in which a sliding surface is formed, and has a bottom plate that encloses an area below the sliding surface. In an upper portion of the bottom plate, an oil receiving portion is formed to receive lubricant flowing from the sliding surface.