A titanium alloy contains 0.01 to 0.15% by mass of at least one of platinum group elements in total, and the balance being titanium, oxygen, and impurities, wherein, the titanium alloy includes particles of a compound that is made up of at least one of the platinum group elements, titanium, and oxygen, an average size of the particles on a surface of the titanium alloy is 1 µm or smaller, and a number density of the particles on the surface of the titanium alloy is 25/1000 µm 2 or more. This titanium alloy has a high corrosion resistance and capable of keeping a low contact resistance in comparison with conventional titanium alloys having an equivalent platinum group element content.