Various types of high-strength steel sheets have been developed and applied to auto-bodies to meet on the requirements from environmental and safety points of view. Required properties and metallurgical concepts of high-strength steel sheets for panels, structural parts and chasses are summarized. Future requirements and development of high-strength steel sheets and their application technologies are also discussed.%環境との調和と衝突安全性に対する要求が年々強まるrn中，車体構成部品構造や適用される材料の変更による要rn求達成のための努力が積極的に進められている．この中rnで鉄鋼材料は車両重量の約70%を占めるため，その果たrnす役割は大きいといえる．
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