To provide a spiral type separation membrane element reducing pressure loss and increasing a permeated liquid amount.
This spiral type separation membrane element includes: a porous hollow tube 1 having a plurality of through-holes 2 leading from the outer peripheral surface to the inner peripheral surface; and a laminated body which is wound around the porous hollow tube 1, and includes a separation membrane and flow channel material. Non-penetrating recessed parts 3 are formed in a region on the outer peripheral surface of the porous hollow tube 1 which is covered by the laminate body. In order for permeated liquid to flow into the non-penetrating recessed parts 3, the permeated liquid is able to smoothly flow within the non-penetrating recessed parts 3, and the resistance to the permeated liquid can be reduced. Thereby, the pressure loss is reduced, and the permeated liquid amount can be increased.
HAMADA TOSHIMITSU
JIZO SHINICHI
Noriaki Aso
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