A first vibrating section of an ultrasonic transmitting unit includes a distal side relay portion provided in a first vibration main body portion and positioned at a relay antinode position being one of a first antinode position. A second vibrating section includes a proximal side relay portion provided in a second vibration main body portion with being continuous with the distal side relay portion of the first vibrating section or abutting on the distal side relay portion and positioned at a middle position different from a second antinode position and a second node position, and a non-contact vibrating portion forming a distal end of the second vibrating section and extending up to a part the distal direction side from a distal end of the first vibrating section with being not in contact with the first vibrating section.
