To provide an upper tank which is easily constituted.

This upper tank can store pachinko balls which are lifted through a ball lifting device from a ball storage tank at the lower section of a game island at the upper section of the game island in the game island in which a plurality of pachinko game machines are provided in a row. The upper tank is partitioned by a partitioning wall into a storage section for temporarily storing pachinko balls, and a feeding/receiving section for performing the feeding and the receiving of pachinko balls with other islands. On the partitioning wall, an overflow port which feeds out pachinko balls overflowing in the storage section to the feeding/receiving section is provided. Then, the upper tank is constituted in such a manner that pachinko balls fed into the feeding/receiving section can be fed out to the storage section or the ball storage tank.