To provide a lens, a lens array or a lens module the optical axis of which and the other members are combined with good accuracy, to provide a method for manufacturing the lens array, and to provide its manufacturing apparatus.

The lens 1 is formed by cutting the lens array 10 the plural lens faces of which are formed on at least one face. The lens 1 has a structure in which a convex part 12 projecting from a lens base 13 is formed of an upper force 21 and a lower force 31. The lens face 11 is formed on the end face of the convex part 12. A side face of the convex part 12 is utilized as a standard face of the other members.