A lug terminal which can easily realize automatic welding, can reduce the diameter of the package structure of the piezoelectric ceramic ultrasonic transducer, and can solve the problem that arc ignition failure is likely to occur in the injection molded layer and the use of the lug terminal. Provided ultrasonic scaler. The lug terminal (1) used for the ultrasonic scaler includes a first connection plate (110), a second connection plate (120), a third connection plate (130), and a fourth connection plate (140), and a first connection plate. The plate (110) and the second connection plate (120) are both connected to the third connection plate (130) and are arranged on the same side of the third connection plate (130), and are connected to the fourth connection plate (140). One end is connected to the third connection plate (130) and is made of a white copper material. The ultrasonic scaler includes a piezoelectric ceramic ultrasonic transducer (2) and two lug terminals (1), and both of the two lug terminals (1) are driving electrodes for the chip of the piezoelectric ceramic ultrasonic transducer (2). And each of the lug terminals (1) is connected to one connection line (3), and each of the lug terminals (1) is connected to the connection line (3) and the lug terminal (1). Are connected by a resistance welding method. [Selection diagram] FIG.自動溶接を実現しやすく、圧電セラミック超音波トランスデューサのパッケージ構造の直径を小さくすることが可能になり、射出成形層でアーク点火不良が生じやすいという問題を解決することができるラグ端子及びそれを用いた超音波スケーラーを提供する。超音波スケーラーに用いられるラグ端子（１）は、第１接続板（１１０）、第２接続板（１２０）、第３接続板（１３０）及び第４接続板（１４０）を含み、第１接続板（１１０）と第２接続板（１２０）は、いずれも第３接続板（１３０）に接続され、且つ第３接続板（１３０）の同じ側に配置され、第４接続板（１４０）の一端は、第３接続板（１３０）に接続され、白銅材料で製造される。超音波スケーラーは、圧電セラミック超音波トランスデューサ（２）と２枚のラグ端子（１）を含み、２枚のラグ端子（１）は、いずれも圧電セラミック超音波トランスデューサ（２）のチップ用駆動電極に嵌設され、且つチップ用駆動電極を引き出すために用いられ、各ラグ端子（１）にはそれぞれ１本の接続線（３）が接続され、接続線（３）とラグ端子（１）との間は、抵抗溶接法で接続される。 【選択図】図５
