Stainless steel material having antibacterial properties and antiviral properties and method for manufacturing same

A stainless steel material having antibacterial properties and antiviral properties, comprising a Cu-rich region extending along a crystal grain boundary on a surface of the stainless steel material and in a surface layer located immediately below the surface and having a concentration of Cu (copper) higher than an average Cu concentration,

• wherein the Cu-rich region is a region in which a Cu concentration is higher by 5% by mass or more relative to the average Cu concentration and has a Cu grain boundary layer that extends continuously at a depth of 10 μm to 200 μm from the surface of the stainless steel material,
• an average number of Cu grain boundary layers is 2.0 or more per 100 μm of a distance parallel to the surface of the stainless steel material in a cross section orthogonal to the surface of the stainless steel material,
• and a chromatic index a* in a CIE Lab color space on the surface is 0 or more and 3.0 or less.