A coin ejection apparatus makes it possible to surely prevent incorrect dispensing due to incorrect normal rotation of a rotary disk or disks in one or more coin ejection units in a non-driving state while permitting normal and reverse rotations of the disk in a driving state. An unnecessary rotation prevention mechanism has a prevention member that prevents unnecessary rotation of the disk in the non-driving state. Engagement/disengagement of the prevention member with a coupling gear is switched responsive to shift between the driving state and the non-driving state. When the relevant coin ejection unit is in the driving state, the prevention member and the coupling gear are disengaged, permitting normal and reverse rotations of the disk. When the relevant coin ejection unit is in the non-driving state, the prevention member and the coupling gear are engaged, preventing incorrect normal rotation of the disk to result in incorrect dispensing.