To stabilize variation in conveying speed of a transfer conveying belt even when transfer paper different in paper thickness is used for printing.

Based on thickness profile as thickness characteristic data of a conveying means for conveying the transfer paper, the image forming apparatus controls a driving means for rotating the conveying means. The image forming apparatus includes a storage means configured to store the thickness profile of each paper type, and a control means configured to read out the thickness profile in accordance with the paper type of the conveyed transfer paper from the storage means, generate control information for controlling drive for rotation by the driving means by using the thickness profile read, and transmit it to the driving means.