本发明的电镀装置包括管单元密封机构用于封闭钢管的管轴方向内的内部通道;以及布置管状不溶性阳极，从而面对的管端部内的内螺纹; 安装和多个管端部的密封机构在所述管端中容纳的喷嘴;具有多个围绕所述钢管的管轴沿径向延伸的喷嘴的电镀液供给机构包括管 从轴向方向观察时，各喷嘴的前端位于所述内螺纹和不溶性阳极之间;每个喷嘴是交叉的喷嘴的延伸方向的方向上，并且围绕管轴 电镀液朝约顺时针或左旋转的方向注入。

Electroplating apparatus of the present invention includes a tube unit sealing mechanism for closing the internal passage inside the tube axis direction of the steel pipe; and disposed cylindrical insoluble anode so as to face the internal thread inside the tube end portion; a plating solution supply mechanism having a plurality of nozzles extending radially around the tube axis of the steel pipe; and a plurality of tube end sealing mechanism mounted on the tube end together with the housing the nozzle therein; equipped with a tube when viewed from the axial direction, the tip of each nozzle is located between the internal thread and an insoluble anode; each nozzle is a direction intersecting the extending direction of the nozzle, and around the tube axis the plating solution is injected toward the direction of rotation about right around or left.