A medium processing device includes a casing that has an opening through which an interior of the casing communicates with an exterior thereof, a first unit that is storable in the casing, with a first end thereof at a side of the opening, a second unit that is storable in the casing, with a second end thereof at the side of the opening, a conveyance section, including a roller, provided in the first unit, the conveyance section conveying a medium by rotating the roller, and a roller manual drive section that is provided in the first unit, and the is configured to allow the roller to be manually rotated. The roller manual drive section is provided in a vicinity of the first end of the first unit when the first unit is stored in the casing.