To make a swing stable and sure by forming a thimble to be mounted just locally between a joint of a finger, of which the grip is lacked, and additionally providing a spike made of metal or studs made of a hard rubber or the like.

A thimble part 1 is formed while using a material such as synthetic resin or metal corresponding to the purpose of use. Further, a spike part 2 made of metal or the like and a stud part 3 made of hard rubber or the like are additionally provided while being selectively combined. A sports tool is grasped and swung while fitting this thimble 1 between a joint of a finger. The thimble parts 1 are prepared in various sizes or a free size. Corresponding to a combination of the spike part 2 or the stud part 3 mounted on the thimble 1, the grip of the finger is improved, slip or the like is prevented and stable swing is enabled.