An image forming apparatus includes plural developing devices arranged at a fixed interval, plural toner cartridges arranged at an interval smaller than the interval among the developing devices, and plural sub-hoppers that receive toners stored in the toner cartridges and feed the toners to plural developing devices. The plural sub-hoppers respectively have toner receiving ports formed in positions opposed to toner discharging ports of the toner cartridges and have toner supply ports for feeding toners to the developing devices. The plural sub-hoppers are arranged at an interval same as an arrangement pitch of the developing devices.