Three point bending test of aluminum tubular structure with hat cross-section was carried out under impact condition.The central portion of the structure was impacted at 10 m/s by the upper anvil attached to the drop-weight.The tubular material was an aluminum alloy A5052-H34 sheet with 1 mm thickness.The structure consists of a hat-shaped part fabricated with V-bending operation and a flat sheet.They are adhesively bonded at the flange with a thermosetting epoxide resin.In addition to the aluminum structure(standard structure),the structure with carbon fiber reinforced thermos-plastic(CFRTP)sheet was also tested.The sheet was also adhesively bonded.The objective of the present study is to exhibit the effect of such attachment on the deforming behavior in the bending.