Ultrasonic bonding device and terminal-fitted electric wire

An ultrasonic bonding device, comprising:

• an anvil that has a mounting surface on which a terminal having conductivity and a terminal end of a conductor part of an electric wire having conductivity are mounted;
• and
• a horn disposed facing the anvil along an up-and-down direction, and that has an application surface for applying ultrasonic vibration to the terminal disposed on the mounting surface and the conductor part disposed on the terminal, wherein
• the application surface has an application surface main body part that extends along an axial direction intersecting the up-and-down direction, and an application surface end inclined part located at an end part of a side toward which the electric wire extends in the axial direction, and that is formed in a concave curved surface that separates from the mounting surface along the up-and-down direction toward an end in the axial direction, and
• the mounting surface has a mounting surface main body part that extends along the axial direction and that faces the application surface main body part along the up-and-down direction, and a mounting surface end inclined part located at an end part of a side toward which the electric wire extends in the axial direction and that faces the application surface end inclined part along the up-and-down direction, and that is formed in a convex curved surface that approaches the application surface side along the up-and-down direction toward an end in the axial direction.