An aluminum alloy plastic worked article including a plastic worked portion formed of a thinned portion 22 formed by plastic working and rib portions 21 formed at two ends of this thinned portion 22 having an approximately H-shaped or U-shaped cross-section. The plastic worked portion is a plastic worked portion 2 having strain portions 23 in each of which an equivalent strain of up to 4.0 mm/mm generated by plastic working is present, and the strain portions 23 are each located in the vicinity of the surface of the plastic worked portion 2 at a boundary between the thinned portion 22 and each of the rib portions 21 and are each formed of a non-recrystalline texture N of aluminum which is not recrystallized or formed of the non-recrystalline texture N and a fine crystalline texture M which is recrystallized but has a crystal grain of 500 μm or less.