PURPOSE: To improve sense of hand fingers in fitting to a ball catching tool and to make catching motion a player intends to perform possible without changing the shape of an ideal ball catching tool for baseball by placing a sheet material on a palm skin.

CONSTITUTION: Sheet materials 5a, 5b, 5c and 5d are placed between palm skins 1a and 1b constituted by at least two sheets of them from the crotch base part 3 to the edge part 4 of each finger bag.