According to one embodiment of the present invention is a ceiling tile, the stacked structure of the body, such as a gypsum core layer having one surface covered by a display layer of plastic sheet material. The other side surface of the core layer is covered by a layer of a light reflecting material. The design layer, when installed on the ceiling, and offers the design surface, which can be seen visually, and the light reflective layer has an exposed reflective surface. The design layer and the light reflection layer is formed on the opposite surface of the rigid core layer seal leakage. Entire peripheral edge of the tile and the edge of the laminated portion of the design surface, and the reflecting surface is covered by a plastic tape for forming a leak-sealing peripheral edge parts of laminate tiles gas seal.