The invention provides an apparatus for manufacturing a lens array and a method of manufacturing the lens array. The apparatus for manufacturing the lens array includes a first lens forming unit that has a plurality of blades forming partition walls on a polymer substrate on which a parallax image is formed and a plurality of nozzles discharging a polymer, a detecting unit that detects a position of the parallax image, and a scanning control unit that adjusts a scanning start position of the first lens forming unit based on the position of the parallax image detected by the detecting unit and controls forming of the partition walls by the blades and discharging of the polymer to a region between the partition walls through the nozzle on a surface of the polymer substrate on which the parallax image is formed.