The present invention, while exhibiting excellent desalination performance even at high temperatures, and also provides a separation membrane and the separation membrane element having excellent handling properties and quality. Separation membrane of the present invention includes the surface of the supply-side and the separation membrane body having a transparent side surface, and a permeation-side passage material to stick to the surface of the permeate side of the separation membrane main body, wherein the permeate side flow path member is configured of polypropylene as a main component, and satisfies the following requirements (a) ~ (c).
(A) softening point temperature of 60 ° C. or higher.
(B) tensile elongation in the standard state is 10% or more.
(C) yield stress at 50 ° C. humid is not less than 2 MPa.