Titanium materials have poor wear resistance, and surface treatments have been applied in an effort to improve it. In this study, iron was selected as a hardening layer forming element, and an attempt was made to see whether a hardened layer of iron solid solution could be formed on the surface of pure titanium. As a result, an iron solid solution layer with a thickness of 0.6 mm and a hardness of over 350 HV was obtained. When an iron solid solution layer with an iron concentration of 9 mass％ or more was formed, the wear amount reduced for both titanium and steel materials.