Separator core and separator roll

The invention provides a separator core and a separator roll. A core (u1, u2) around which a nonaqueous electrolyte secondary battery separator is to be wound. A side surface of the core (u1, u2) hasa depression (20). This makes it possible, in a case where cores (separator cores) are stored by being stacked while still wet after cleaning, to prevent damage to a core caused by a problem where cores stick together and an core lower in a stack falls when a core higher in the stack is removed. 本发明提供种间隔件卷芯以及间隔件卷绕体，在清洗之后将被润湿的芯体(间隔件卷芯)重叠来进行保管时，能够抑制芯体彼此粘附，抑制拿取被重叠的上方的芯体时下方的芯体发生坠落损伤。对于卷绕非水电解液二次电池用间隔件的芯体(u1、u2)，芯体(u1、u2)的侧面具有凹部(20)。