PROBLEM TO BE SOLVED: To provide a joining device which is configured to form a joint part of a wearing article and enables the discrimination of the wearing article by a pattern of the joint part.SOLUTION: A joining device (3) includes an annular rotating body (31), a plurality of anvil units (32) located on one of the outside and the inside of a circumferential surface of the rotating body, and a plurality of ultrasound units (33) which are located on the other of the outside and the inside of the circumferential surface and face the anvil units, and oscillates ultrasonic waves from the ultrasound units to the anvil units when the anvil units and the ultrasound units are brought into contact. In the joining device, the anvil unit includes a tightly-holding face (42) which can make contact with the ultrasound unit and a plurality of protruding parts (43) formed on the tightly-holding face, and patterns of the protruding parts are different among the anvil units.【課題】接合部のパターンによって着用物を識別することができる着用物品の接合部を形成するための接合装置を提供する。【解決手段】環状の回転体(31)と、前記回転体の周面の外側および内側のいずれか一方に位置する複数のアンビルユニット(32)と、いずれか他方に位置し前記アンビルユニットに対向する複数の超音波ユニット(33)とを有し、前記アンビルユニットおよび前記超音波ユニットが接触して、前記超音波ユニットから前記アンビルユニットへと超音波を発振する接合装置(3)において、前記アンビルユニットは、前記超音波ユニットに接触可能な挟持面(42)と、前記挟持面に形成された複数の凸部(43)とを有し、前記凸部のパターンが、前記アンビルユニット間で異なることを特徴とする前記接合装置。【選択図】図1