A label attachment device comprising: a label opening unit configured to preliminarily open a tubular label supplied as folded in a sheet; a label expansion unit having openable and closable expansion claws configured to expand the label preliminarily opened by the label opening unit; a mounting, on which an attachment target object is mounted; and an expansion claws rise and fall mechanism configured to cause the expansion claws to rise and fall, wherein the expansion claws are configured to fall, thereby attaching the tubular label expanded by the expansion claws onto the attachment target object, and/or a mounting rise and fall mechanism configured to cause the mounting to rise and fall, wherein the mounting is configured to rise, thereby inserting the attachment target object into the tubular label expanded by the expansion claws, and whereby with the expansion claws rise and fall mechanism and/or the mounting rise and fall mechanism the expansion claws are removed from the label, thereby attaching the label to the attachment target object that is moving along a predetermined movement path, characterized in that the expansion claws rise and fall mechanism includes: a cam follower attached to the label expansion unit; and a cam disposed along movement paths of the expansion claws and configured to guide the cam follower, and/or the mounting rise and fall mechanism includes: a cam follower attached directly or via another member to the mounting; and a cam disposed along a movement path of the mounting and configured to guide the cam follower; the respective rise and fall mechanism is configured to adjust a height position of the expansion claws, respetively a height position of the mounting, thereby adjusting a position of attachment of the label to the attachment target object; and wherein the respective cam (29, 45) includes: a fixed portion, which cannot rise and fall; a rise-and-fall portion, which can rise and fall; and a connection portion (32u, 32d), which connects the fixed portion and the rise-and-fall portion so as to swing by following a rising and falling motion of the rise-and-fall portion, and the rise-and-fall portion adjusts the height position of the expansion claws and/or of the mounting, or wherein in the respective cam (29, 45), a portion corresponding to an operation of inserting the attachment target object into the tubular label is a movable portion (37a, 38a) slidable obliquely upward and downward or slidable upward and downward, so that the movable portion is slid obliquely upward and downward or slid upward and downward, thereby adjusting the height position of the expansion claws and/or of the mounting. a label opening unit configured to preliminarily open a tubular label supplied as folded in a sheet; a label expansion unit having openable and closable expansion claws configured to expand the label preliminarily opened by the label opening unit; a mounting, on which an attachment target object is mounted; and an expansion claws rise and fall mechanism configured to cause the expansion claws to rise and fall, wherein the expansion claws are configured to fall, thereby attaching the tubular label expanded by the expansion claws onto the attachment target object, and/or