A preform supplying apparatus of the invention includes an alignment guidance chute (80) having a guide member (83, 84) that slides a plurality of preforms (P) under their own weight by inclination and guides the preforms to a preform alignment conveyance unit (39), and the preform alignment conveyance unit (39) that conveys the preforms (P) guided from the alignment guidance chute (80) in an aligned state, and groove parts along an inclination direction are formed to the guide members (83, 84) and inner wall surfaces of the groove parts have shapes which causes the preforms (P) sliding down inside the groove parts to be aligned in a line.