Accumulative roll bonding (ARB) is a kind of severe plastic deformation (SPD) processes developed by Y.Saito and N.Tsuji in 1998. As the ARB process uses rolling deformation, it can be applied to continuous production of large-scale materials. In fact, the ARB has been already used for fabricating UFG thin sheets with around 0.1 mm thicknesses of stainless steels by a Japanese company. The ARB process is also useful in fundamental research works, and the grain size dependences of strength, tensile ductility, toughness, etc., have been systematically clarified by the use of bulky samples fabricated by the ARB process. In this review presentation, the speaker will introduce the principle, actual techniques, and microstructure evolution in the ARB process, summarize its advantages, and discuss future perspective of the ARB process and the studies on UFG or nanostructured metallic materials.