To provide a cartridge for sterilization which is suitable for the sterilization of a closed space, makes it possible to safely handle a sterilizer (sterilization liquid for instance) and surely recognize the using amount (sterilization state), and is recyclable.

The cartridge for sterilization comprises a porous member 101, a sterilizer bag 102 disposed so as to surround the outer peripheral surface of the porous member 101 inside which the sterilizer 102a is enclosed, and a cover 103 disposed so as to cover the outer surface of the porous member 101 and the sterilizer bag 102. The cover 103 is provided with a projection 103a. By making fluid F flow to the flow passage 101a of the porous member 101 and moving the projection 103c in a center axis direction X, the sharp projected end of the projection 103c bursts through the sterilizer bag 102, the sterilizer 102a enclosed inside permeates the porous member 101 and is evaporated by the fluid F flowing through the flow passage 101a, and the sterilizer 102a is mixed in the fluid by a fixed ratio.