One object is to provide an electron beam sterilization apparatus includes: an inner-surface sterilization chamber (5) including an inner-surface electron beam application device and a blocking chamber (6) for receiving a preform product (P) from the inner-surface sterilization chamber (5) and blocking X-rays produced by application of the electron beam. The blocking chamber (6) includes an upstream opening (62) and a downstream opening (63) formed therein, the preform product (P) being received through the upstream opening (62) and transferred through the downstream opening (63). The blocking chamber (6) includes: a gripper (74) for gripping the preform product (P) a sterilized rotation table (71) for conveying the gripped preform product (P) in a circular path and a blocking wall (81) not in contact with the sterilized rotation table (71) and configured to block the X-rays. The blocking wall (81) faces the upstream opening (62) or the downstream opening (63) and has a larger area than the upstream opening (62) or the downstream opening (63) facing thereto.
