Tool for ultrasonic bonding and apparatus for ultrasonic bonding

A tool for ultrasonic bonding used for an ultrasonic vibration bonding apparatus configured to pressurize, from above, a bonding target material disposed on a surface of a substrate and apply ultrasonic vibration to said bonding target material to bond said bonding target material onto the surface of said substrate, wherein

• a protrusion region that contacts with said bonding target material at application of ultrasonic vibration is provided at a tip portion of said tool for ultrasonic bonding,
• said protrusion region includes a plurality of convex portions formed separately from each other, said plurality of convex portions each having a predetermined tip portion curvature more than “0” from a middle part of the protrusion region to a top part of the protrusion region, said plurality of convex portions being equally spaced at a first interval in a first direction, said first direction being a longitudinal direction of said protrusion region,
• a first direction outermost convex portion positioned outermost in said first direction among said plurality of convex portions is disposed separately from an end part of said protrusion region in said first direction by a first direction end part distance, and
• said plurality of convex portions are disposed so that a first disposition condition {0.349≤EX/DX≤0.510} is satisfied where DX represents said first interval and EX represents said first direction end part distance.