A medium processing device includes a conveyance guide that forms first, second and third conveyance paths that intersect, a blade configured to be rotatable around a blade center point, and that switches a conveyance route of the medium by connecting any two of the three conveyance paths with each other, and a first pair, second pair and third pair of conveyance rollers that are rotatable and are configured to hand off the medium between two conveyance paths connected by the blade. The first pair of conveyance rollers includes a first roller and a second roller. The second roller is closer than the first roller to the third pair of conveyance rollers. A radius of the second roller is larger than a radius of the first roller. A first center holding distance is different from one or both of a second center holding distance and a third center holding distance.