A surgical stapler comprising a staple cartridge comprising a curved deck configured to support tissue is disclosed. The curved deck comprises an inner radius of curvature, an outer radius of curvature, a first step, and a second step. The staple cartridge further comprises a first longitudinal row of staple cavities, a second longitudinal row of staple cavities, and staples removably stored in the first and second longitudinal rows of staple cavities. The surgical stapler further comprises an anvil, a first camming member, a second camming member, a cutting member, a driver, and support means for supporting the driver when the driver moves the cutting member relative to the anvil and the staple cartridge.
