An image forming apparatus includes a toner case containing a toner and an installed member in which the toner case is installed. The toner case has a case main body in which rotating members are installed, and a following coupling. The case main body has a discharge port discharging the toner. The following coupling is connected to the rotating member and has a pressured part. The installed member has a drive coupling and a drive source rotating the drive coupling. The drive coupling is linked to the following coupling and has a pressuring part. The drive coupling and following coupling are rotated in the same rotation direction around the same rotation axis by pressuring the pressured part by the pressuring part. The pressured part is provided so as to come close to the rotation axis from an upper stream side to a lower stream side in the rotation direction.