Undercut processing mechanism, molding die and molded product

An undercut processing mechanism which is fitted to a molding die for forming a molded product having an undercut portion and which includes a molding core for forming the undercut portion, the undercut processing mechanism comprising:

• an inclined pin movable in a first direction inclined relative to a die opening direction of the molding die at the time of removal of the molded product from the die, to allow the removal of the molding core from the undercut portion;
• and
• a guide section configured to guide the movement of the inclined pin,
• wherein:
• the inclined pin has a slide portion slidable in contact with the guide section;
• the guide section is so shaped as to contact the slide portion over an entire stroke of the inclined pin so that the first direction of movement of the inclined pin can be regulated, is so shaped as to have a bending rigidity higher in a particular direction of the slide portion compared to a bending rigidity in other directions of the slide portion, and is so shaped to have the bending rigidity higher in a first direction in which a load and a bending moment concentrate in the slide portion than the bending rigidity in a second direction, the second direction being perpendicular to the first direction.