▎ 摘　　要

NOVELTY - Separation membrane (10) has a support (11) having water permeability; a matrix layer (12) supported by the support and having first holes; and a graphene layer (13) including a graphene material supported by the matrix layer and including at least one of graphene and graphene oxide, and having second holes (15) overlapping the first holes (14). USE - As separation membrane. ADVANTAGE - The separation membrane has excellent durability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for producing the separation membrane, comprising arranging a matrix layer using a matrix material on the surface of a graphene layer containing a graphene material containing at least one of graphene and graphene oxide, forming first holes in the matrix layer, after the first hole forming step, forming second holes in the graphene layer along the first holes, and arranging the integrated body of the matrix layer and the graphene layer in which the first holes and the second holes are respectively formed on the surface of a water-permeable support so that the matrix layer side is in contact with the support. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the separation membrane. 10Separation membrane 11Support 12Matrix layer 13Graphene layer 14First hole 15Second hole 151Inner wall