Forward Osmosis Membrane and Forward Osmosis Membrane Module Including Same

A forward osmosis membrane composed of a support membrane and a separation functional layer, wherein:

• the support membrane comprises at least a porous support,
• the separation functional layer is provided on the porous support,
• the porous support comprises a dense layer and a macro-void layer in that order from the side contacting with the separation functional layer, in the depthwise direction,
• the macro-void layer is a layer having macro-voids with long diameters of 1.0 μm or greater,
• the dense layer is a layer lacking macro-voids,
• the thickness of the dense layer is 1.0 to 9.5 μm, and
• the macro-voids:
• are present at 0 to 0.20/μm in region A which extends from the interface between the separation functional layer and the porous support up to a depth of 0 to 5.0 μm, and
• are present at 0.04 to 0.40/μm in region B which extends from the interface between the separation functional layer and the porous support up to a depth of 5.0 to 10.0 μm.