An image forming apparatus comprising: feeding means configured to feed a sheet to a main conveyance path; first conveyance means configured to convey the sheet along the main conveyance path; image forming means (10, 11) configured to form an image on the sheet; reverse means configured to pull in the sheet on which the image has been formed by the image forming means (10, 11), the sheet having been conveyed from the main conveyance path, and reverse a conveyance direction of the sheet to feed the sheet to a sub-conveyance path after a trailing end of the sheet has passed through a branch point of the main conveyance path and the sub-conveyance path; second conveyance means configured to again convey the sheet that has been fed to the sub-conveyance path by the reverse means, from the sub-conveyance path to the main conveyance path; a driving source (M2, M3) configured to drive the first conveyance means and the second conveyance means; and control means (101, 102, 104) configured to control the reverse means and the second conveyance means so as to cause a first sheet that is fed to the sub-conveyance path by the reverse means to wait upstream of the second conveyance means in the sub-conveyance path, wherein the first sheet that is waiting straddles the branch point, characterized in that the first conveyance means is configured to change a conveyance speed of the sheet fed from the feeding means from a first speed to a second speed, the image forming means (10, 11) is configured to form said image on the sheet that is conveyed from the first conveyance means at the second speed, and the control means (101, 102, 104) is further configured to cause the reverse means to convey the first sheet that is waiting to the second conveyance means in accordance with a timing at which the first conveyance means completes changing of a conveyance speed of a second sheet that follows the first sheet from the first speed to the second speed, and move a trailing end of the first sheet downstream of the branch point before the second sheet reaches the branch point. feeding means configured to feed a sheet to a main conveyance path; first conveyance means configured to convey the sheet along the main conveyance path; image forming means (10, 11) configured to form an image on the sheet; reverse means configured to pull in the sheet on which the image has been formed by the image forming means (10, 11), the sheet having been conveyed from the main conveyance path, and reverse a conveyance direction of the sheet to feed the sheet to a sub-conveyance path after a trailing end of the sheet has passed through a branch point of the main conveyance path and the sub-conveyance path; second conveyance means configured to again convey the sheet that has been fed to the sub-conveyance path by the reverse means, from the sub-conveyance path to the main conveyance path; a driving source (M2, M3) configured to drive the first conveyance means and the second conveyance means; and control means (101, 102, 104) configured to control the reverse means and the second conveyance means so as to cause a first sheet that is fed to the sub-conveyance path by the reverse means to wait upstream of the second conveyance means in the sub-conveyance path, wherein the first sheet that is waiting straddles the branch point, characterized in that the first conveyance means is configured to change a conveyance speed of the sheet fed from the feeding means from a first speed to a second speed, the image forming means (10, 11) is configured to form said image on the sheet that is conveyed from the first conveyance means at the second speed, and the control means (101, 102, 104) is further configured to cause the reverse means to convey the first sheet that is waiting to the second conveyance means in accordance with a timing at which the first conveyance means completes changing of a conveyance speed of a second sheet that follows the first sheet from the first speed to the second speed, and move a trailing end of the first sheet downstream of the branch point before the second sheet reaches the branch point.