Parison supply device and supply method

A parison supply device that continuously supplies, to a blow molding die, a parison section of a parison discharged from an extrusion die, the parison section having a specified length, the parison supply device comprising:

• a plurality of tension chucks grasping the parison and pulling the parison in a discharge direction of the parison between the extrusion die and the tension chuck;
• and
• a tension chuck operation unit that operates a plurality of the tension chucks, wherein
• the tension chuck operation unit causes each of the tension chucks to perform a repeated operation of grasping the parison at a first position near the extrusion die and moving to a second position, separated from the extrusion die farther than the first position such that, before a preceding one of the tension chucks is separated by a set distance from the extrusion die at the second position, a following one of the tension chucks grasps the parison at the first position, and then the parison section is supplied to the blow molding die.