WATERPROOFING BOARD DEVICE

To suppress the increase in leakage due to the deflection of a waterproofing board without increasing the rigidity of the waterproofing board.SOLUTION: A waterproofing board device, including waterproofing boards 3A, 3B, 3C that block the entry of water, and guide rails 2L, 2R that have insertion grooves 2a into which ends of the waterproofing boards 3A, 3B, 3C in a width direction are inserted and that stand to hold the waterproofing boards 3A, 3B, 3C inserted into the insertion grooves 2a, wherein the ends of the waterproofing boards 3A, 3B, 3C in the width direction are provided with hook sections 3a that extend in the insertion grooves 2a in a direction that intersects the width direction and a height direction of the waterproofing boards 3A, 3B, 3C, and the guide rails 2L, 2R are provided with hook receiving sections 2b that engage with the hook sections 3a and suppress the deflection of the waterproofing boards 3A, 3B, 3C when the waterproofing boards 3A, 3B, 3C receive water pressure.SELECTED DRAWING: Figure 3 【課題】防水板の剛性を上げることなく、防水板の撓みによる漏水量の増加を抑制する。【解決手段】水の浸入を堰き止める防水板３Ａ，３Ｂ，３Ｃと、防水板３Ａ，３Ｂ，３Ｃの幅方向の端部が差し込まれる差込溝２ａを有し、該差込溝２ａに差し込まれた防水板３Ａ，３Ｂ，３Ｃを立設保持するガイドレール２Ｌ，２Ｒと、を備える防水板装置であって、防水板３Ａ，３Ｂ，３Ｃの幅方向の端部は、差込溝２ａ内において防水板３Ａ，３Ｂ，３Ｃの幅方向及び高さ方向と交差する方向に延在するフック部３ａを備え、ガイドレール２Ｌ，２Ｒは、防水板３Ａ，３Ｂ，３Ｃが水圧を受けたとき、フック部３ａと係合して防水板３Ａ，３Ｂ，３Ｃの撓みを抑制するフック受け部２ｂを備える。【選択図】 図３