To provide a shaft body keeping a surface structure arranged to exert an adsorbability to a finger tip on the shaft body, particularly, a gripping part of the shaft body.

A structure in which front ends of many pillar protrusions such as circular cylindrical or prismatic protrusions formed on the surface of the shaft body are cut by a fixed angle for the protrusions to be easy to fall in one direction, or a structure in which the pillar-shaped protrusions themselves are formed with an angle to generate a van der Waals force between the shaft body surface and a pressing surface is arranged on the shaft body surface.