An image forming apparatus that forms developer images on a continuous medium includes a control part that performs a developer image forming on an intermediate transfer body with an interval; a transfer part that transfers developer images to the continuous medium; an interval detection part that detects the interval of positions to which the developer images; and an interval information memory that stores interval information of the interval. Wherein, the control part obtains the interval information from the interval information memory when starting an operation of forming the developer image, and determines a timing of forming the developer images on the intermediate transfer body based on the interval information, and when the interval is detected by the interval detection part, the control part updates the interval information in the interval information memory based on the interval that is detected.

An image forming apparatus that forms developer images on a continuous medium includes a control part that performs a developer image forming on an intermediate transfer body with an interval; a transfer part that transfers developer images to the continuous medium; an interval detection part that detects the interval of positions to which the developer images; and an interval information memory that stores interval information of the interval. Wherein, the control part obtains the interval information from the interval information memory when starting an operation of forming the developer image, and determines a timing of forming the developer images on the intermediate transfer body based on the interval information, and when the interval is detected by the interval detection part, the control part updates the interval information in the interval information memory based on the interval that is detected.