To obtain a moistureproof paper having excellent moistureproof properties, also capable of being recycled and further hardly providing a bad effect caused by a moistureproof layer exposing on the surface.

This moistureproof paper 10 comprises the first layer 1, the second layer 2 and a waterproofing layer 3 sandwiched between the layers 1 and 2. Each of the layers 1 and 2 is composed of a paper material. The waterproofing layer 3 has waterproofing properties and water-disaggregation properties. A constituting material of the waterproofing layer 3 preferably comprises a main polymer and a wax.