A toner container is attachable to and detachable from a toner supply portion of an image forming apparatus. The toner container includes an attaching portion configured to be engaged with an attached portion of the toner supply portion such that the toner container is selectively attached to the toner supply portion. The attached portion includes an engaged portion around which first interruption keys are disposed. The attaching portion includes an engaging portion and a plurality of key members. The engaging portion is configured to be engaged with the engaged portion. The key members are larger in number than the first interruption keys and include second interruption keys formed in correspondence with the first interruption keys. Among the key members, the second interruption keys that interrupt with the first interruption keys are cut so that the engaging portion and the engaged portion can be engaged with each other.