A sheet bundle conveying apparatus that conveys a sheet bundle formed of a predetermined number of sheets, the apparatus comprising: a plurality of conveying belts juxtaposed so that the sheet bundle is conveyed while being placed thereon; a regulating guide that is movable so as to sandwich the sheet bundle placed on the conveying belts from both sides in a direction orthogonal to a conveyance direction; a belt driving part that drives the conveying belts; a guide driving part that drives the regulating guide; and a driving control part that controls the belt driving part and the guide driving part, wherein the conveying belts have stopping members (6A, 6B) having a form abuttable on a first end surface on an upstream side and/or a second end surface on a downstream side in the conveyance direction of the sheet bundle being placed, and have a placement area for the sheet bundle on the upstream side and/or the downstream side of the stopping members (6A, 6B), and when the sheet bundle is placed on the placement area, the driving control part controls the belt driving part so that the conveying belts move so as to bring the stopping members (6A, 6B) to predetermined positions, respectively, after the sheet bundle is placed on the placement area, the driving control part (a) controls the guide driving part so that the regulating guide sandwiches the sheet bundle from both sides in the orthogonal direction and (b) controls the belt driving part so that at least one of the conveying belts (1A, 1B) is moved to make the stopping members (6A, 6B) of the conveying belt (1A, 1B) abut on the first end surface or the second end surface of the sheet bundle and at the same time or thereafter, make the second end surface or the first end surface of the sheet bundle abut on the stopping member (6B, 6A) of the other of the conveying belts (1B, 1A), and the driving control part controls the belt driving part and the guide driving part so that the sheet bundle is conveyed along the regulating guide with the stopping members (6A, 6B) abutting on the first end surface and the second end surface as in the above. a plurality of conveying belts juxtaposed so that the sheet bundle is conveyed while being placed thereon; a regulating guide that is movable so as to sandwich the sheet bundle placed on the conveying belts from both sides in a direction orthogonal to a conveyance direction; a belt driving part that drives the conveying belts; a guide driving part that drives the regulating guide; and a driving control part that controls the belt driving part and the guide driving part, wherein the conveying belts have stopping members (6A, 6B) having a form abuttable on a first end surface on an upstream side and/or a second end surface on a downstream side in the conveyance direction of the sheet bundle being placed, and have a placement area for the sheet bundle on the upstream side and/or the downstream side of the stopping members (6A, 6B), and when the sheet bundle is placed on the placement area, the driving control part controls the belt driving part so that the conveying belts move so as to bring the stopping members (6A, 6B) to predetermined positions, respectively, after the sheet bundle is placed on the placement area, the driving control part (a) controls the guide driving part so that the regulating guide sandwiches the sheet bundle from both sides in the orthogonal direction and (b) controls the belt driving part so that at least one of the conveying belts (1A, 1B) is moved to make the stopping members (6A, 6B) of the conveying belt (1A, 1B) abut on the first end surface or the second end surface of the sheet bundle and at the same time or thereafter, make the second end surface or the first end surface of the sheet bundle abut on the stopping member (6B, 6A) of the other of the conveying belts (1B, 1A), and the driving control part controls the belt driving part and the guide driving part so that the sheet bundle is conveyed along the regulating guide with the stopping members (6A, 6B) abutting on the first end surface and the second end surface as in the above. when the sheet bundle is placed on the placement area, the driving control part controls the belt driving part so that the conveying belts move so as to bring the stopping members (6A, 6B) to predetermined positions, respectively, after the sheet bundle is placed on the placement area, the driving control part (a) controls the guide driving part so that the regulating guide sandwiches the sheet bundle from both sides in the orthogonal direction and (b) controls the belt driving part so that at least one of the conveying belts (1A, 1B) is moved to make the stopping members (6A, 6B) of the conveying belt (1A, 1B) abut on the first end surface or the second end surface of the sheet bundle and at the same time or thereafter, make the second end surface or the first end surface of the sheet bundle abut on the stopping member (6B, 6A) of the other of the conveying belts (1B, 1A), and the driving control part controls the belt driving part and the guide driving part so that the sheet bundle is conveyed along the regulating guide with the stopping members (6A, 6B) abutting on the first end surface and the second end surface as in the above.