A metallic wiring film, which is not exfoliated even when exposed to a plasma of hydrogen, is provided. A metallic wiring film 20a is constituted by an adhesion layer 51 in which an additive metal is added to copper and a low-resistance metallic layer 52, which is made of pure copper, is disposed on the adhesion layer 51. When the additive metal made of at least one of Ti, Zr and Cr, and oxygen are included in a copper alloy which is in the adhesion layer 51 and a source electrode and a drain electrode are formed from it, copper does not precipitate at an interface between the adhesion layer 51 and the silicon layer even when being exposed to the hydrogen plasma, which prevents exfoliation from occurring between the adhesion layer 51 and the silicon layer. If the amount of additive metal increases, the adhesion layer 51 cannot be etched with an etching liquid for etching the low-resistance metallic layer 52, so that the maximum additional amount to permit the etching to be performed is the upper limit.