The invention provides an endodontic file including a tapered body and an amorphous Ti-Zr-B thin film. The tapered body is made of a metal alloy, and the amorphous Ti-Zr-B thin film is formed on a surface of the tapered body.本發明提出一種根管銼針,其包含:一錐形主體、及一非結晶鈦-鋯-硼(Ti-Zr-B)合金薄膜。錐形主體為金屬合金材質製成的,而非結晶鈦-鋯-硼合金薄膜為形成於錐形主體的表面。