PURPOSE: A laminated sheet is provided to be applied to a blackboard rotating in a caterpillar track and to reduce maintenance costs for products by improving bonding capacity. CONSTITUTION: A laminated sheet comprises: a first urethane bonding layer(2) which includes urethane materials and in which a writing-layer is combined on one side; a first film(3) combined on the other side of the first urethane bonding layer using the adhesive force of the first urethane bonding layer; a second film(5) which is positioned at a constant interval with the first film; a second urethane bonding layer(4) which includes the urethane material and in which one side is combined on the first film and the other side is combined on the second film, and a bonding layer for combining a first seat with a pair of rollers. The first sheet is a sheet in which the first urethane bonding layer, the first film, the second urethane bonding layer, and the second film are sequentially laminated.
