Provided are an ultrasonic processing system and ultrasonic processing method that can provide a seal part with a desirable finished state. A system (50) for performing ultrasonic processing of a work web traveling in the machine direction (MD) has a first machine element which is one of either an ultrasonic horn (67) or an anvil, and a second machine element which is the other of these. A work web (31) is placed on an outer circumferential surface (63) of a rotating drum (62) that rotates, and travels in the machine direction (MD) with the rotating drum (62). The first machine element is provided on the inward side of the rotating drum (62), and the second machine element is provided on the outer side of the rotating drum (62). The first and second machine elements repeat a step of moving forward so as to intersect the machine direction (MD) and traverse the work web (31), and a step of moving backward, and during both steps, ultrasonic processing is performed on the work web (31) while pressurized welding through the work web (31) is performed.本發明之課題係提供:可以製得較佳完成狀態之密封部的超音波處理裝置及超音波處理方法。用以對往機械方向(MD)行進之帶體(31)實施超音波處理的裝置(50),係具有:屬於超音波焊頭(67)和砧之其中一方的第1機械要素、以及屬於另一方的第2機械要素。帶體(31)係載於進行旋轉之鼓筒(62)的外周面(63),與鼓筒(62)一起往機械方向(MD)行進。第1機械要素係設於鼓筒(62)內側、第2機械要素係設於鼓筒(62)外側。第1、第2機械要素,係以與機械方向(MD)交叉而橫越帶體(31)的方式反覆進行前進運動之步驟及進行後退運動之步驟,於該兩步驟中,隔著帶體(31)進行壓接來對帶體(31)實施超音波處理。21‧‧‧尿布連續體31‧‧‧帶體50‧‧‧超音波處理裝置51‧‧‧搬運手段(夾輥)51a‧‧‧導引輥52‧‧‧搬運手段(夾輥)53‧‧‧超音波處理部61‧‧‧中心軸62‧‧‧滾筒62a‧‧‧前面板63‧‧‧外周面65、65a、65b、65c、65d‧‧‧超音波處理要素66‧‧‧托架構件66a‧‧‧板部66c‧‧‧側板66d‧‧‧前方軸66e‧‧‧中間軸67‧‧‧第1機械要素(焊頭)67a‧‧‧作用面67b‧‧‧轉換器67c‧‧‧增幅器68‧‧‧第2機械要素(底砧)69‧‧‧滑塊75‧‧‧支柱76、76b-76d‧‧‧周面77‧‧‧滑軌100‧‧‧凸輪從動件手段(第2凸輪從動件)106‧‧‧內側驅動帶107‧‧‧外側固定帶152‧‧‧凸輪手段(第2凸輪)
