A sheet discharge device has a sheet discharge port, a conveying guide, discharge roller pairs, corrugation members, and first biasing members, and discharges sheets onto a discharge tray sequentially. The corrugation members are arranged between the discharge roller pairs to protrude beyond a nip portion in them and stiffens the sheet by pressing one side of the sheet. The first biasing members bias the corrugation members in the protruding direction. Each of the corrugation members has, in a region extending from the upstream side to a downstream-side end part of the discharge roller pairs in the sheet discharge direction and including the nip portion, a first pressing part making contact with one side of the sheet and, in a region further on the downstream side of the downstream-side end part of the discharge roller pairs, a second pressing part making contact with one side of the sheet.