To provide a molding die for manufacturing a contact lens with high yield by preventing chips or bubbles from being included.

This molding die is equipped with a female die 2 with a recessed face constituting a cavity and a male die 3 with a projecting face forming the cavity, and when these female die 2 and male die 3 are combined, the difference in diameter between mutually matched face 22, 24 which are opposed to each other for regulating a deviation in the optical axes of the female die 2 and the male die 3 and collaborate with each other on the outer peripheral edge of the cavity, is set to be 0.1-0.5 mm. Further, voids between these matched faces 22, 34 are formed as a passageway part 5 communicating with the cavity.