An image forming apparatus includes a fixing part, a first conveying part, a second conveying part, a biasing member and a separation supporting mechanism. The first conveying part following the fixing part includes rollers to convey a sheet at second linear velocity faster than first linear velocity of the fixing part. The second conveying part following the first conveying part conveys the sheet at third linear velocity faster than the first linear velocity near a heating rotation body of the fixing part from a first reference line passing through nip parts of the fixing part and first conveying part. The separation supporting mechanism supports one roller in a direction separating from another roller and receives force from the sheet in the separating direction to the one roller when the second conveying part conveys the sheet to withdraw the one roller in the separating direction from the first reference line.