A first protrusion is provided between an operation lever and a lock lever. The operation lever is for moving a pressure roller. The lock lever is provided for a sheet guide member for guiding a sheet that has passed through a fixing unit downstream in the sheet conveyance direction. The lock lever is for locking the sheet guide member at a position where the sheet guide member is engaged with a housing. The first protrusion protrudes from the sheet guide member toward an exterior cover. The first protrusion is provided with a second protrusion on the lock lever side of the first protrusion.