The purpose of the present invention is to provide a sheet binding processing apparatus capable of promptly performing a binding process for binding a sheet bundle set at a manual setting portion and a sheet bundle set at a processing tray. The present invention comprises a sheet binding processing apparatus including a processing tray on which introduced sheets are stacked into a bundle shape, a manual tray at which a sheet bundle is set from the outside of the apparatus, a binding device which performs a binding process on the sheet bundle stacked on the processing tray and the sheet bundle set at the manual tray, a moving portion which moves the binding device to a first binding position for performing the binding process on the sheet bundle stacked on the processing tray and a second binding position for performing the binding process on the sheet bundle set at the manual tray, and a controller which causes the binding device, in a case that the binding process is not performed on the sheet bundle stacked on the processing tray, to wait due to the moving portion at the second binding position side as being at the outside of a sheet introducing area where sheets are introduced to the processing tray.