In the press forming of martensitic steel sheets into automotive parts, larger plastic deformation is introduced in the martensite matrix compared to that of ultra-high-strength steel bolts or tool materials. Basic study on the press formability of martensitic steel sheets revealed that tempering below 240-degree C was effective to minimize coarse precipitation of cementite at which cracks often initiated during heavy deformation. At the same time, advanced press forming technique of automotive parts without defects such as cracking and insufficient shape precision has been necessary to be developed together with the material development to apply ultra-high-strength martensitic steel sheets with less formability compared to lower tensile strength grade high-strength steel sheets. In this paper, effect of tempering treatment on the mechanical properties and hydrogen embrittlement from the viewpoint of applicability of martensitic steel sheets for automotive parts will be reviewed. And a unique study of copper (Cu) precipitation in the martensite matrix during tempering aiming for improved ductility of martensitic steel sheets will also be shown. After these reviews with some typical examples of related press forming technologies, key R & D issues for expanded application of martensitic steel sheets for automotive parts will be discussed.