Molding apparatus

A molding apparatus comprising:

• a die having a hollow cylinder shape and provided with a die recessed portion that is open toward a second side in an axial direction of the die;
• a core disposed on a radial direction inner side of the die, being relatively movable toward a first side and the second side in an axial direction of the die with respect to the die, and forming a flow passage for molten resin between the core and the die;
• a slider housed in the die recessed portion in a state in which a gap in the die radial direction exists between the slider and the die recessed portion, the slider being slidable in the die axial direction;
• a wall portion forming part of an inner wall in the die radial direction of the die recessed portion, positioned to oppose the core, and extending in such a way that a thickness of the wall portion gradually decreases heading from the first side toward the second side in the die axial direction;
• and
• a slide mechanism causing the slider to slide in the die axial direction,
• wherein the wall portion is elastically flexible outward in the die radial direction in a case in which the wall portion is pushed by the molten resin flowing through the flow passage.