Apparatus for supporting lumbar for seat back

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The present invention refers to seat back lumbar support device in particular relates to, vehicle seat back in lumbar support installed, irrespective of of the body of the vehicle passenger as comfort of sitting out to the outside of the hollow, seat back frame (100) of fixation plate side end (200) and a; said fixed plate (200) vertically between the of from each other in the direction of adjustable in is provided, one side is cooled by a front air rectilinear (310) is formed a plurality of lumbar support block (300) and; said lumbar support block (300) box a cable (400) and; said lumbar support block (300) of said fixed plate (200) connecting the connecting wires (500) are implanted into a semiconductor substrate in, and free from impurity is re-with form material, excellent lumbar support force, regardless of the size of vehicle. for using easily.