A mold 6 for manufacturing a microlens substrate 1 is disclosed. The microlens substrate is provided with a plurality of microlenses each having a predetermined convex shape. The mold is used to press a base material of the microlens substrate to form the plurality of microlenses thereon. The mold 6 has a roll shape having an outer peripheral surface, and a plurality of concave portions 61 each having a predetermined shape corresponding to the convex shape of each microlens are provided on the outer peripheral surface of the mold 6 for pressing the base material of the microlens substrate. In this case, the plurality of concave portions 61 are formed by means of an etching process with a mask.