A first vibrating section of an ultrasonic transmitting unit includes a proximal 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 distal side relay portion provided in a second vibration main body portion with being continuous with the proximal side relay portion of the first vibrating section or abutting on the proximal 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 proximal end of the second vibrating section and extending from the distal side relay portion toward the proximal direction side with being not in contact with the first vibrating section.
