Image forming apparatus and sheet conveyance apparatus

An image forming apparatus to form an image on a sheet using an image forming unit, the image forming apparatus comprising:

• a conveyance portion configured to convey the sheet;
• a fixing portion including a heating portion configured to heat the sheet;
• a guide portion configured to guide the sheet, wherein the guide portion faces a conveyance path through which the sheet passes and is disposed at a downstream side of the fixing portion in a conveyance direction of the sheet;
• a first extending portion extending in a direction crossing a vertical direction, wherein the first extending portion is disposed upstream of the guide portion and is disposed at the downstream side of the fixing portion in the conveyance direction;
• and
• a second extending portion extending from the first extending portion to a downstream side of the first extending portion in the conveyance direction,
• wherein, in a direction crossing the conveyance direction, the guide portion is disposed at one side of the conveyance path and the second extending portion is disposed to project more than the guide portion from the one side of the conveyance path to another side of the conveyance path.