To provide an image forming apparatus which has a function to seal a sheet on which an image is recorded and can take measures against leak of a secret without making a constitution complicated.

The image forming apparatus has a mode in which forms a prescribed toner pattern for bonding sheets on at least one of the first sheet on which a toner image according to image information is formed by an image forming means, which passes through a fixing means and is carried again to the image forming means and the second sheet which is overlapped with the first sheet before the fixing means, passes through the fixing means in a state of overlapping the sheets so that the toner image according to the image information is in between the first sheet and the second sheet, and bonds the first sheet and the second sheet.

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