To provide a sheet suitable as the material of a packaging member high in flexibility and moistureproofness and having hygroscopicity, a packaging sheet comprising the sheet, and a PTP and blister pack package obtained by molding the sheet.

The sheet contains a layer (A) containing a specific cycloolefin copolymer or contains the layer (A) containing the cycloolefin copolymer and/or the layer (B) arranged at least on one side of the layer (A) and containing a compound having a hygroscopic function. The packaging sheet comprising the sheet and the PTP and blister pack package obtained by molding the sheet are also disclosed.