PROBLEM TO BE SOLVED: To provide an electron ray sterilization unit capable of suppressing the corrosion of a membrane in an electron ray irradiation apparatus produced upon the cleaning of the inside of a sterilization container caused by a sterilization gas.SOLUTION: Provided is an electron ray sterilization unit including: an electron ray irradiation apparatus equipped with an electron ray generator provided at the inside of a vacuum enclosure and generating electron rays, an injection window provided at the vacuum enclosure and injecting the electron rays generated at the electron ray generator to the outside of the vacuum enclosure and a membrane provided so as to cover the injection window for maintaining the vacuum state in the vacuum enclosure and passing through the electron rays； a sterilization container of storing the electron ray irradiation apparatus； and a shielding mechanism, when the inside of the sterilization container is cleaned with a sterilization gas, shielding the membrane from the sterilization gas and protecting the same. The shielding mechanism includes: a frame part surrounding the circumference of the injection window； a shielding plate capable of opening/closing the part surrounded with the frame part； and a pressing apparatus, when the frame part is closed with the shielding plate, pressing the shielding plate against the frame part, sealing the space part surrounded by the membrane, the frame part and the shielding plate and shielding the membrane from the sterilization gas.【課題】滅菌ガスによる滅菌容器内部の洗浄の際に生じる電子線照射装置における膜の腐食を抑制することが可能な電子線滅菌装置を提供する。【解決手段】電子滅菌装置は、真空筐体内に設けられ、電子線を発生させるための電子線発生器、真空筐体に設けられ、電子線発生器で発生した電子線を真空筐体の外部へ照射するための出射窓、および真空筐体内の真空状態を維持するために出射窓を覆うように設けられ、電子線を透過する膜を備える電子線照射装置と；電子線照射装置を収納する滅菌容器と；滅菌容器内を滅菌ガスで洗浄する際に、膜を滅菌ガスから遮蔽して保護するための遮蔽機構と；を備える。遮蔽機構は、出射窓の周りを囲む枠部と、枠部で囲まれる部分を開閉可能な遮蔽板と、遮蔽板で枠部を閉じる際に、枠部に遮蔽板を押し付けて、膜と、枠部と、遮蔽板とで囲まれる空間部分を密閉し、膜を滅菌ガスから遮蔽するための押付装置と、を備える。【選択図】図１
