An apparatus (20) for manufacturing a composite sheet according to the present invention includes an ultrasonic processing unit (40), which includes an ultrasonic fusion machine (41) including an ultrasonic welding head (42), and a peripheral surface portion. The first roller (31) having unevenness, and the ultrasonic processing unit (40) is formed to sandwich the first sheet (1) and the second sheet (2) overlapping each other on the convex portion of the first roller (31) A ultrasonic vibration is applied between the ultrasonic welding head (42) and the ultrasonic welding head (42), thereby forming a through hole (14), and a rotating shaft (1) with the first roller (31) is formed at the front end of the ultrasonic welding head (42). 31c) The orthogonal cross-sectional shape is an arc-shaped vibration application surface (42t) recessed in a direction away from the rotation axis (31c).本發明之複合片材之製造裝置(20)具備超音波處理部(40)，該超音波處理部(40)具有具備超音波焊頭(42)之超音波融合機(41)、及周面部具有凹凸之第1輥(31)，超音波處理部(40)形成為將相互重疊之第1片材(1)及第2片材(2)夾持於第1輥(31)之凸部與超音波焊頭(42)之間並施加超音波振動，藉此，形成貫通孔(14)，於超音波焊頭(42)之前端部形成有與第1輥(31)之旋轉軸(31c)正交之剖面形狀為朝向遠離旋轉軸(31c)之方向凹陷之圓弧狀之振動施加面(42t)。
