The present invention good adhesion integrity of the metal needle body and the coating resin is a clear a scale mark of penetration depth for the confirmation, production cost also provides an inexpensive injection needle. A metal needle is a metal needle 1 that is capable of applying a pulse wave power from the metal surface of the distal end portion 4 of the injection needle, the surface of the root portion of the needle pulse wave power is the exposed metal surface for applying the surface portion to be inserted into the body of the needle comprises an electrically insulating thermosetting resin coating layer 9 which is colored white by covering a metallic cylindrical portion 8, a and a memory layer 3 of black, which is printed on the top. On the colored heat-curable resin coating layer and the memory layers are further formed the transparent electrically insulating thermosetting resin overcoat layer, the thickness of the colored heat-curable resin coating layer 20~30μm , the thickness of the scale layer 1~3μm, the thickness of the overcoat layer is preferably a 5~50μm. .BACKGROUND 2【課題】金属針本体と被覆樹脂の接着一体性が良く、刺入深度確認用の目盛マークが鮮明であり、製造コストも安価な注射針を提供する。【解決手段】金属製注射針は、注射針の先端部4の金属面からパルス波電力を印加することが可能な金属製注射針1であって、注射針の根元部の表面はパルス波電力を印加するための金属露出面であり、注射針の人体に挿入する部分の表面は、金属円筒部分8を被覆して白色に着色された電気絶縁性熱硬化性樹脂塗膜層9と、その上に印刷された黒色の目盛層3を含む。着色された熱硬化性樹脂塗膜層と目盛層の上に、さらに透明な電気絶縁性熱硬化性樹脂上塗り層が形成され、着色された熱硬化性樹脂塗膜層の膜厚は20~30μm、目盛層の膜厚は1~3μm、上塗り層の膜厚は5~50μmであるのが好ましい。【選択図】図2
