A sheet conveying device comprising: a first conveyance guide member and a second conveyance guide member (65, 64) disposed to face each other and forming a discharge path extending to a sheet discharge outlet; a first discharge roller and a second discharge roller (25A, 25B) disposed to face each other across the discharge path and configured to nip a sheet member conveyed in the discharge path and discharge the sheet member from the sheet discharge outlet to outside, the first discharge roller being provided in the first conveyance guide member, the second discharge roller being provided in the second conveyance guide member; and at least one first stiffening member projecting toward the discharge path from one of the first conveyance guide member and the second conveyance guide member (65, 64) and extending from a nip portion to an upstream side in a sheet conveyance direction, and configured to stiffen the sheet member by contacting and pressing the sheet member conveyed in the discharge path, the nip portion being formed by the first discharge roller and the second discharge roller, each of the at least one first stiffening member including: a first pressing portion provided in a facing surface that faces the sheet member, and arranged at a position that corresponds to the nip portion when viewed from one side in width direction of the discharge path that is a direction perpendicular to the sheet conveyance direction, the first pressing portion projecting farther toward the other of the first conveyance guide member and the second conveyance guide member (65, 64) than the nip portion; and a guide portion provided in the facing surface, and arranged at a position more on the upstream side in the sheet conveyance direction than the first pressing portion, and configured to guide, toward the first pressing portion, a front end of the sheet member conveyed in the discharge path, characterised in that the guide portion is narrower in the width direction than the first pressing portion. a first conveyance guide member and a second conveyance guide member (65, 64) disposed to face each other and forming a discharge path extending to a sheet discharge outlet; a first discharge roller and a second discharge roller (25A, 25B) disposed to face each other across the discharge path and configured to nip a sheet member conveyed in the discharge path and discharge the sheet member from the sheet discharge outlet to outside, the first discharge roller being provided in the first conveyance guide member, the second discharge roller being provided in the second conveyance guide member; and at least one first stiffening member projecting toward the discharge path from one of the first conveyance guide member and the second conveyance guide member (65, 64) and extending from a nip portion to an upstream side in a sheet conveyance direction, and configured to stiffen the sheet member by contacting and pressing the sheet member conveyed in the discharge path, the nip portion being formed by the first discharge roller and the second discharge roller, a first pressing portion provided in a facing surface that faces the sheet member, and arranged at a position that corresponds to the nip portion when viewed from one side in width direction of the discharge path that is a direction perpendicular to the sheet conveyance direction, the first pressing portion projecting farther toward the other of the first conveyance guide member and the second conveyance guide member (65, 64) than the nip portion; and a guide portion provided in the facing surface, and arranged at a position more on the upstream side in the sheet conveyance direction than the first pressing portion, and configured to guide, toward the first pressing portion, a front end of the sheet member conveyed in the discharge path, characterised in that