There are provided a packaging bag, which allows visual confirmation of the content yet does not bleach medical supplies contained therein, a packaging bag containing medical supplies, and a packaging method for medical supplies. A packaging bag 10 of the present invention includes two front and back films 11 and 12, at least one of which is transparent and are bacteria impermeable and do not transmit molecules as large as or greater than O 2 , wherein a material 13 that is gas permeable and bacteria impermeable is extended on the opening side of at least one of the films, and the periphery of the front and back films except for the opening is sealed. Medical supplies 15 are contained in the packaging bag 10, the opening is sealed to form a seal part 16b, and sterilization processing using EO gas or the like is executed. The EO gas is then removed and it is sealed by a seal part 16c. Even if the medical supplies 15 are exposed to an antiseptic solution such as H 2 O 2 , it will not enter the packaging bag 10.
