An image forming apparatus includes: a main body storage portion that stores control information which defines a control condition of an option device; and a main body control portion that makes a printing portion perform operation in accordance with the control condition of the option device, and based on the control condition of the option device, gives an operation instruction to an option control portion, wherein in a case where an unsuitableness error, the option control portion transmits the control information stored in the option storage portion to the main body control portion, and the main body control portion updates the control information such that the control information stored in the main body storage portion becomes the control information suitable for specifications of the option device.