An aluminum extrusion material for hydraulic bulge forming, which can produce hydraulic bulge forming components possessing highly reliable and sufficient strength and rigidity capable of withstanding not only a static load, but also a twist load and dynamic load is provided. Also provided is a hydraulic bulge forming method using the aluminum extrusion material for hydraulic bulge forming as a raw material. The aluminum extrusion material is hollow and used as a material for hydraulic bulge forming. The material is characterized by having a partition wall radially crossing the hollow part of the extrusion material, wherein the partition wall is provided with an allowance in length to become flat when the hollow part is formed into a prescribed shape by hydraulic bulge forming.
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