To provide a technique effective in effectively utilizing cleaning kits in the cleaning kits used for cleaning a cleaning target.

The cleaning kit 111 includes: a brush part 141; and a holding part 121 separably joined to the brush part 141. While the brush part 141 is being joined to the holding part 121, the brush part 141 forms a main cleaning part of the cleaning kit. While the brush part 141 is being separated from the holding part 121, the holding part 121 forms a main cleaning part of the cleaning kit.