A binding machine that binds objects with a tape, the binding machine comprising: a staple magazine unit configured to accommodate a plurality of staples; a main handle to which the staple magazine unit is attached; a clincher arm rotatably attached to the main handle such that the clincher arm approaches a leading staple of the plurality of staples; and a clincher provided on the clincher arm, and configured to bend the leading staple, which is driven from the staple magazine unit and penetrates overlapped portions of the tape, when the clincher arm is rotated to approach the leading staple, characterized in that the clincher has, on a surface thereof, a first groove that extends in an acute angle direction with respect to an axial direction of a rotation shaft of the clincher arm and has a first groove length and a first groove width, and a second groove that extends in an acute angle direction with respect to the axial direction of the rotation shaft of the clincher arm and has a second groove length and a second groove width, wherein the second groove is disposed offset with respect to the first groove in a width direction of the first groove, wherein the binding machine further comprises: a guiding portion provided at a tip of the staple magazine unit and configured to regulate a position of the clincher in the axial direction of the rotation shaft of the clincher arm in a state where the clincher is in close proximity to the staple magazine unit, wherein the guiding portion has a pair of guide surfaces (57L, 57R) inclined such that a gap therebetween increases toward the clincher, the clincher further has a pair of surfaces to be guided that are located on opposite sides of the first groove and the second groove and that are inclined away from the staple magazine unit as getting away from the first groove and the second groove, and in a state where the clincher is in close proximity to the staple magazine unit, one of the pair of surfaces to be guided faces one of the pair of guide surfaces (57L, 57R), and another of the pair of surfaces to be guided faces another of the pair of guide surfaces (57L, 57R). a staple magazine unit configured to accommodate a plurality of staples; a main handle to which the staple magazine unit is attached; a clincher arm rotatably attached to the main handle such that the clincher arm approaches a leading staple of the plurality of staples; and a clincher provided on the clincher arm, and configured to bend the leading staple, which is driven from the staple magazine unit and penetrates overlapped portions of the tape, when the clincher arm is rotated to approach the leading staple, characterized in that the clincher has, on a surface thereof, a first groove that extends in an acute angle direction with respect to an axial direction of a rotation shaft of the clincher arm and has a first groove length and a first groove width, and a second groove that extends in an acute angle direction with respect to the axial direction of the rotation shaft of the clincher arm and has a second groove length and a second groove width, wherein the second groove is disposed offset with respect to the first groove in a width direction of the first groove, a first groove that extends in an acute angle direction with respect to an axial direction of a rotation shaft of the clincher arm and has a first groove length and a first groove width, and a second groove that extends in an acute angle direction with respect to the axial direction of the rotation shaft of the clincher arm and has a second groove length and a second groove width, wherein the second groove is disposed offset with respect to the first groove in a width direction of the first groove, a guiding portion provided at a tip of the staple magazine unit and configured to regulate a position of the clincher in the axial direction of the rotation shaft of the clincher arm in a state where the clincher is in close proximity to the staple magazine unit, wherein the guiding portion has a pair of guide surfaces (57L, 57R) inclined such that a gap therebetween increases toward the clincher, the clincher further has a pair of surfaces to be guided that are located on opposite sides of the first groove and the second groove and that are inclined away from the staple magazine unit as getting away from the first groove and the second groove, and in a state where the clincher is in close proximity to the staple magazine unit, one of the pair of surfaces to be guided faces one of the pair of guide surfaces (57L, 57R), and another of the pair of surfaces to be guided faces another of the pair of guide surfaces (57L, 57R).