An image-forming device comprising: a casing; a conveying path disposed in the casing to convey a recording sheet; a pair of registration rollers disposed on the conveying path to regulate a leading edge of the recording sheet conveyed along the conveying path; a sheet accommodating unit disposed below the casing and configured to accommodate a recording sheet; and a process cartridge detachably mounted on the casing, wherein the conveying path has a U-shaped part that U-turns the recording sheet accommodated in the accommodating unit from a direction toward one end of the casing to a direction toward the other end of the casing, wherein the U-shaped part has a topmost part and wherein the process cartridge comprises: a developer accommodating unit that supplies a developer; a photosensitive member disposed on the conveying path, a visible image being formed on the photosensitive member with the developer, the visible image being transferred onto the recording sheet whose leading edge is regulated by the pair of registration rollers; and a lower wall portion forming an upstream guide part disposed upstream of the pair of registration rollers on the conveying path to guide the recording sheet toward the pair of registration rollers in cooperation with the conveying path, characterized in that the U-shaped part has a falling slope part that is opposed to the lower wall portion and that diagonally goes down from the topmost part to a nipping portion of the pair of registration rollers, the upstream guide part is formed with a concaved part that is concaved in a direction away from the conveying path, the image forming device further comprises a manual feeding path for conveying a recording sheet for a manual feeding, the concaved part is defined by a first end and a second end when viewed in a width direction of the conveying path, and the manual feeding path is parallel to a line connecting the first end and the second end, and the manual feeding path is parallel to the falling slope part. a casing; a conveying path disposed in the casing to convey a recording sheet; a pair of registration rollers disposed on the conveying path to regulate a leading edge of the recording sheet conveyed along the conveying path; a sheet accommodating unit disposed below the casing and configured to accommodate a recording sheet; and a process cartridge detachably mounted on the casing, wherein the conveying path has a U-shaped part that U-turns the recording sheet accommodated in the accommodating unit from a direction toward one end of the casing to a direction toward the other end of the casing, wherein the U-shaped part has a topmost part and wherein the process cartridge comprises: a developer accommodating unit that supplies a developer; a photosensitive member disposed on the conveying path, a visible image being formed on the photosensitive member with the developer, the visible image being transferred onto the recording sheet whose leading edge is regulated by the pair of registration rollers; and a lower wall portion forming an upstream guide part disposed upstream of the pair of registration rollers on the conveying path to guide the recording sheet toward the pair of registration rollers in cooperation with the conveying path, a developer accommodating unit that supplies a developer; a photosensitive member disposed on the conveying path, a visible image being formed on the photosensitive member with the developer, the visible image being transferred onto the recording sheet whose leading edge is regulated by the pair of registration rollers; and a lower wall portion forming an upstream guide part disposed upstream of the pair of registration rollers on the conveying path to guide the recording sheet toward the pair of registration rollers in cooperation with the conveying path, characterized in that the U-shaped part has a falling slope part that is opposed to the lower wall portion and that diagonally goes down from the topmost part to a nipping portion of the pair of registration rollers, the upstream guide part is formed with a concaved part that is concaved in a direction away from the conveying path, the image forming device further comprises a manual feeding path for conveying a recording sheet for a manual feeding, the concaved part is defined by a first end and a second end when viewed in a width direction of the conveying path, and the manual feeding path is parallel to a line connecting the first end and the second end, and the manual feeding path is parallel to the falling slope part.