To provide a ball supplier which can be used for simulating tracks of a slow ball, a grounder, and various balls therebetween thrown to a fielder or a batter.

This ball supplier for exercise has a slender slope tray 30 to hold balls B in a line on a foldable tripod 11. A gate 50 on the lower end of the tray 30 releases balls B one by one periodically against gravity from the tray 30. One end edge of a trampoline is pivotally attached to the tripod 11. The center part of the trampoline is enabled to repulse a ball released from the tray 30. Eye bolts 99, 101 are connected in between the tripod 11 and the trampoline 80 to allow an angle position of the trampoline 80 to be changed. By adjusting the eye bolts, it is possible to realize an arbitrary track of a repulsed ball modulating a slowly thrown ball, a grounder ball, and a various ball therebetween.