The ultrasound measurement instrument of the present invention comprises a main body component having a polyhedral shape a nozzle that is provided in one plane of the main body component, the nozzle and communicating with the main body component via a hollow portion and a contact component blocking off a face of the nozzle on the opposite side from the main body component in a flat shape such that ultrasonic waves are transmitted. The contact component is inclined with respect to a first axis that is parallel to the plane of the polyhedral body in which the nozzle is provided, and to a second axis that is perpendicular to the first axis and is parallel to the plane. A cartilage surface is inclined with respect to a biological surface, and the contact component is inclined by the same degree in the inclination direction thereof. Therefore, the ultrasonic waves emitted perpendicular to the face of the main body component where the nozzle is located pass through the contact component and proceed perpendicular to the cartilage surface.
