To provide a cartridge processing method and apparatus in which a one-end opened cartridge is conveyed and the attitude of the one-end opened cartridge is controlled during conveyance so that the cartridge is reliably transferred to the next step in sequence.

A first holding means with a storage part shaped on the outline of a cartridge is attached to a first conveying means in such a way that the storage part has the same attitude in prescribed positions, a one-end opened cartridge with the other end capped is inserted into the storage part from the cap side, a plurality of second holding means with storage parts shaped on the outline of a cartridge are attached to a second conveying means in such a way that the storage parts have the same attitude in prescribed positions, the one-end opened cartridge on the first conveying means is inserted from the cap side and transferred in sequence, a conveyance route is changed, and the one-end opened cartridge is subjected to at least one processing on the conveyance route.