Molding method for vehicular lamp part and molding apparatus for vehicular lamp part

A molding method and apparatus includes movable die 30 and fixed die 20 which form cavity 50 , and extrusion plate 40 movable in the die closing/opening direction. A die surface 32 b corresponding to the undercut portion is formed by separate push-up block 32 , which is fixed to push-up pin 42 , which is tiltably held by extrusion plate 40 , and passes through insertion hole 34 in movable die 30 . A gap 34 a enables push-up pin 42 to tilt in the insertion hole. Push-up block 32 releases the part from the movable die by relative movement between extrusion plate 40 and movable die 30 , and, by further movement of the part, the slanted surface of the undercut portion pushes the die surface of the push-up block in a direction which intersects with the die closing/opening direction to free the undercut portion by tilting the push-up pin and push-up block.