An image erasing apparatus, comprising: a sheet supply portion for supplying a sheet; an ejector (19,20) for ejecting the sheet; a first conveying path to form a conveying path from the sheet supply portion toward the ejector to convey the sheet in a sheet conveying direction; a reader arranged on the first conveying path for reading an image on a surface of the sheet; a second conveying path branching from the first conveying path at a downstream side of the reader in the sheet conveying direction and merging with the first conveying path at a meeting point situated between the sheet supply portion and the reader; an erasure arranged on the second conveying path for erasing the image on the sheet formed with image erasable material; a switching portion arranged on the first conveying path at a downstream side of the reader in a sheet conveying direction to switch the sheet conveying direction to a direction of the ejector (19, 20) or to a direction of the erasure, said second conveying path branching from the first conveying path at a position where the switching portion is arranged; a controller wherein the controller is configured to: - change the sheet conveying direction by the switching portion; and - accept at least one processing mode out of a first processing mode to read the image in the reader, a second processing mode to erase the image in the erasure, and a third processing mode to judge whether or not the sheet is reusable in the reader, and to perform a processing of the accepted processing mode. a sheet supply portion for supplying a sheet; an ejector (19,20) for ejecting the sheet; a first conveying path to form a conveying path from the sheet supply portion toward the ejector to convey the sheet in a sheet conveying direction; a reader arranged on the first conveying path for reading an image on a surface of the sheet; a second conveying path branching from the first conveying path at a downstream side of the reader in the sheet conveying direction and merging with the first conveying path at a meeting point situated between the sheet supply portion and the reader; an erasure arranged on the second conveying path for erasing the image on the sheet formed with image erasable material; a switching portion arranged on the first conveying path at a downstream side of the reader in a sheet conveying direction to switch the sheet conveying direction to a direction of the ejector (19, 20) or to a direction of the erasure, said second conveying path branching from the first conveying path at a position where the switching portion is arranged; a controller wherein the controller is configured to: - change the sheet conveying direction by the switching portion; and - accept at least one processing mode out of a first processing mode to read the image in the reader, a second processing mode to erase the image in the erasure, and a third processing mode to judge whether or not the sheet is reusable in the reader, and to perform a processing of the accepted processing mode. - change the sheet conveying direction by the switching portion; and - accept at least one processing mode out of a first processing mode to read the image in the reader, a second processing mode to erase the image in the erasure, and a third processing mode to judge whether or not the sheet is reusable in the reader, and to perform a processing of the accepted processing mode.