Abstract: A loose-leaf sheet for a transparency storage book is formed from a single paper sheet, and has a transparency receiving side, a binding side, a clamping side, and a blocking side. The clamping side is folded along a first fold line to form a clamping strip. The blocking side is folded along a second fold line to form a blocking strip. The binding side is folded along a third fold line to form a binding strip unit, which is formed with a plurality of binding holes. A transparency for projector use can be inserted into the sheet through the transparency receiving side, and is clamped on the clamping side. The binding strip unit, the clamping strip and the blocking strip are arranged in a U-shape, within which the transparency is confined.