Patent ID: 8608964

Claim:
A spiral reverse osmosis membrane element comprising a cylindrically wound body comprising a perforated core tube and, spirally wound therearound, a separation membrane, a feed-side passage material and a permeation-side passage material in a laminated state, and a sealing portion for preventing a feed-side liquid and a permeation-side liquid from being mixed together, wherein the separation membrane has a structure that a porous support and a skin layer are successively laminated on a non-woven fabric layer, wherein the non-woven fabric layer has an average pore diameter of 8-12 μm, and a ratio of maximum pore diameter to average pore diameter maximum pore diameter:average pore diameter) of 1:1 to 4:1; and a barrier portion disturbing impregnation of a sealing resin is not formed in the non-woven fabric layer, wherein the sealing portion sealed with the sealing resin is provided at the edges of the separation membrane, and wherein the separation membrane is impregnated with the sealing resin at least up to the vicinity of the skin layer through the porous support.