Patent ID: 7869307

Claim:
An ultrasonic transmission member comprising: a main body including a first end part, a second end part, and an outer peripheral surface, transmitting ultrasonic waves inputted at the first end part to the second end part, and formed of a metal glass, a cross section of the first end part being larger than a cross section of the second end part, the metal glass formed from an alloy comprising at least three elements including at least one of Ti, Zr, and Al, an element ration of Ti in the alloy ranging between more than or equal to 40% and less than or equal to 53%, and the element ratio of Zr in the alloy ranging between more than or equal to 55% and less than or equal to 60%, a distance from an end of the first end part which is opposite to the second end part up to an end of the second end part which is opposite to the first end part being an integer multiple of a half of one wavelength of the ultrasonic wave, and a starting position of transition from the first end part to the second end part on the outer peripheral surface of the main body substantially coinciding with a node of the ultrasonic wave.