Abstract: There is provided an apparatus for manufacturing lenses for vehicle lamps, wherein the lenses are formed from at least first and second types of synthetic resins by molding the first and second synthetic resins integrally with each other. The apparatus includes a first mold having a common mold and a first stationary mold and defining a first cavity in which the first synthetic resin is injection molded, and a second mold constructed from the common mold and a second stationary mold and defining a second cavity in which the first synthetic resin and the second synthetic resin are molded integrally with each other with the first synthetic resin being contained within the second cavity. A partition wall is provided on the first stationary mold in such a manner as to protrude therefrom for preventing the first synthetic resin from intruding into any place other than the first cavity when the first mold is closed.