To safely and easily perform nail trimming operation in trimming of nails while preventing scattering of the nails.

The cover is a bag-like cover made of a flexible material such as cloth, including opening portions made of a stretchable material at both lateral ends to insert the hands, and a transparent window provided partially so that the operation inside the bag is sufficiently viewable. The nail trimming operation is performed in this bag, whereby scattering of the nails can be prevented. Since a third openable and closable opening is provided in a part of the cover, a user can trim his/her own toenails or nails of a third person. Since the nail trimming operation is performed in the bag-like cover substantially closed, the user can perform the nail trimming operation using various forms of nailclippers without regard for the scattering of nails. Further, since the bag is made of the flexible material, it can be folded small. Therefore the user can easily carry the bag to perform the nail trimming operation where he/she can.