A vibration transmission member includes: a main body portion configured to transmit ultrasound vibration; a treatment portion that is provided at a distal end of the main body portion, the treatment portion being configured to apply ultrasound vibration to a living tissue; a coating portion that is made of an electrically insulating material containing a first resin, the coating portion being configured to cover a part of a surface of the treatment portion; and a mold portion that is made of an electrically insulating material containing a second resin different from the first resin, and that is fused to at least a part of the coating portion.