An image forming apparatus according to the present disclosure includes a type identification value measurement portion, a determination portion and a speed adjustment portion. The type identification value measurement portion uses, when the print job is executed, a media sensor previously provided in a paper feed cassette to measure a type identification value for a sheet to be transported in the print job. The determination portion determines whether or not an incidence of paper delay corresponding to the measured type identification value for the sheet exceeds a previously set threshold value. The speed adjustment portion lowers, when as a result of the determination, the incidence of paper delay exceeds the threshold value, a transport speed of the sheet as compared with a normal transport speed to execute the print job.