Rotational surface treating device and ring-shaped member for treatment bath

A rotational surface treating device with a high treatment efficiency that allows a treatment liquid to be discharged in a short time and a ring-shaped member for a treatment bath are provided. When atreatment bath (2) is rotated, parts (20) contact an electrode (50) to be electroplated. In this event, a plating liquid (16) is used as circulated by a pump (P). The plating liquid (16) is discharged to the outside through a gap in a side wall (80) for replacement of the plating liquid (16) or the like. During discharge, the plating liquid (16) is not circulated by the pump (P). The gap (8) which is formed in the side wall (80) is formed to be smaller than the minimum dimension of the parts (20) on the inner side. The gap (8) is formed to be wider toward the outer side. Thus, water is discharged immediately. 提供处理液的排出时间较短并且处理效率较高的旋转式表面处理装置和用于处理槽的环状部件。通过处理槽(2)的旋转，部件(20)与电极(50)接触，而实施电镀。此时，镀覆液(16)借助泵(P)而被循环使用。在更换镀覆液(16)时等，在排出镀覆液(16)时从侧壁(80)的空隙向外部放出该镀覆液(16)。在排出时，不进行基于泵(P)的循环。形成于侧壁(80)的空隙(8)在内侧形成为比部件(20)的最小尺寸小。朝向外侧而形成