An image forming apparatus includes a development device, a toner container which includes data indicating whether the toner container is an installation toner container or a replacement toner container and a memory storing the value of a remaining amount related item, a supply portion, a read/write portion which performs the reading and writing of the memory and a control portion which reduces the present value of the remaining amount related item according to the number of sheets printed. When in a state where installation has already been performed, the installation toner container is attached, the control portion stores, in the memory, a value based on the remaining amount of toner before the installation.