A method of manufacturing a frame that is a formed component for aircraft use made of an aluminum alloy, the method comprising: subjecting a material made of an aluminum-lithium alloy containing lithium to solution heat treatment; then performing a cold working process, in which a multi-stage roll forming apparatus including section rolls and curving rolls is used to form the material into a predetermined shape under cold working conditions; and thereafter subjecting the material to artificial age-hardening treatment, wherein when forming the material into the predetermined shape in the cold working process, a compressive strain is imparted to the material, and in the cold working process: the entire material is rolled, with a clearance of first-stage rolls of the multi-stage roll forming apparatus being adjusted to be less than an original thickness of the material, such that the compressive strain of not less than 2 %, the compressive strain being equivalent to a dislocation density necessary for realizing a temper T8 state, is imparted to the material; and thereafter the material is formed by the section rolls at a second or subsequent stage of the multi-stage roll forming apparatus to have a predetermined cross-sectional shape, and then the material is formed by the curving rolls of the multi-stage roll forming apparatus to have a predetermined contour, such that the material is formed into a frame. subjecting a material made of an aluminum-lithium alloy containing lithium to solution heat treatment; then performing a cold working process, in which a multi-stage roll forming apparatus including section rolls and curving rolls is used to form the material into a predetermined shape under cold working conditions; and thereafter subjecting the material to artificial age-hardening treatment, wherein when forming the material into the predetermined shape in the cold working process, a compressive strain is imparted to the material, and in the cold working process: the entire material is rolled, with a clearance of first-stage rolls of the multi-stage roll forming apparatus being adjusted to be less than an original thickness of the material, such that the compressive strain of not less than 2 %, the compressive strain being equivalent to a dislocation density necessary for realizing a temper T8 state, is imparted to the material; and thereafter the material is formed by the section rolls at a second or subsequent stage of the multi-stage roll forming apparatus to have a predetermined cross-sectional shape, and then the material is formed by the curving rolls of the multi-stage roll forming apparatus to have a predetermined contour, such that the material is formed into a frame. the entire material is rolled, with a clearance of first-stage rolls of the multi-stage roll forming apparatus being adjusted to be less than an original thickness of the material, such that the compressive strain of not less than 2 %, the compressive strain being equivalent to a dislocation density necessary for realizing a temper T8 state, is imparted to the material; and thereafter the material is formed by the section rolls at a second or subsequent stage of the multi-stage roll forming apparatus to have a predetermined cross-sectional shape, and then the material is formed by the curving rolls of the multi-stage roll forming apparatus to have a predetermined contour, such that the material is formed into a frame.