A label peeling device comprising: a container holding portion configured to hold a specimen container; and a cutter holder configured to detachably hold a cutter, to apply a blade of the cutter to a side surface of the specimen container held by the container holding portion with a label being attached to the side surface, and to move along an axial direction of the specimen container, thereby peeling the label attached to the side surface of the specimen container; wherein: the cutter is a cutter knife blade extending in a first direction and having a blade portion on one side edge; and the cutter holder comprises a cutter rail extending in the first direction and configured to hold the cutter so as to be movable in the first direction, and a rail drive portion configured to move the cutter rail in a direction different from the first direction, the cutter holder configured to move the cutter along the axial direction of the specimen container while the cutter is being pressed against a surface of the specimen container; wherein the cutter rail forms, in the first direction, a cutter moving path including a process area to which the specimen container is opposed, a supply area located on a primary side of the process area, and a recovery area located on a secondary side of the process area, and the label peeling device comprises: - a cutter sending portion configured to move the cutter in the first direction through the cutter rail; and - a cutter exchange device including a supply portion configured to set the cutter in the supply area, and a - recovery portion configured to recover the cutter placed in the recovery area. a container holding portion configured to hold a specimen container; and a cutter holder configured to detachably hold a cutter, to apply a blade of the cutter to a side surface of the specimen container held by the container holding portion with a label being attached to the side surface, and to move along an axial direction of the specimen container, thereby peeling the label attached to the side surface of the specimen container; wherein: the cutter is a cutter knife blade extending in a first direction and having a blade portion on one side edge; and the cutter holder comprises a cutter rail extending in the first direction and configured to hold the cutter so as to be movable in the first direction, and a rail drive portion configured to move the cutter rail in a direction different from the first direction, the cutter holder configured to move the cutter along the axial direction of the specimen container while the cutter is being pressed against a surface of the specimen container; wherein the cutter rail forms, in the first direction, a cutter moving path including a process area to which the specimen container is opposed, a supply area located on a primary side of the process area, and a recovery area located on a secondary side of the process area, and the label peeling device comprises: - a cutter sending portion configured to move the cutter in the first direction through the cutter rail; and - a cutter exchange device including a supply portion configured to set the cutter in the supply area, and a - recovery portion configured to recover the cutter placed in the recovery area. the cutter is a cutter knife blade extending in a first direction and having a blade portion on one side edge; and the cutter holder comprises a cutter rail extending in the first direction and configured to hold the cutter so as to be movable in the first direction, and a rail drive portion configured to move the cutter rail in a direction different from the first direction, the cutter holder configured to move the cutter along the axial direction of the specimen container while the cutter is being pressed against a surface of the specimen container; wherein the cutter rail forms, in the first direction, a cutter moving path including a process area to which the specimen container is opposed, a supply area located on a primary side of the process area, and a recovery area located on a secondary side of the process area, and the label peeling device comprises: - a cutter sending portion configured to move the cutter in the first direction through the cutter rail; and - a cutter exchange device including a supply portion configured to set the cutter in the supply area, and a - recovery portion configured to recover the cutter placed in the recovery area. - a cutter sending portion configured to move the cutter in the first direction through the cutter rail; and - a cutter exchange device including a supply portion configured to set the cutter in the supply area, and a - recovery portion configured to recover the cutter placed in the recovery area.