The purpose of the invention is to find each component of a blood flow velocity using a simple process. In a secondary beam method, scanning is performed using Doppler measurement ultrasound beams (42) as primary beams, and Doppler measurement components are measured on the basis of the ultrasound waves received from the direction of each Doppler measurement ultrasound beam. Then, ultrasound waves forming secondary beams (58) at a direction that intersects the direction of the Doppler measurement ultrasound beams are sent and received, and the Doppler effect for the secondary beam direction component at the point of intersection of the Doppler measurement ultrasound beam (42) with the secondary beams (58) is measured. Furthermore, using the intersection point as the position for starting integration, an integration calculation based on the law of conservation of mass is performed along the route that intersects with the Doppler measurement ultrasound beams (42), and the component in the direction of the intersection route is found. The initial value for integration is the component in the direction of the intersection route of the integration start point (PA), and is found on the basis of the Doppler measurement component and the secondary beam direction component at the integration start point.Le but de linvention est de trouver chaque composant dune vitesse découlement de sang en utilisant un procédé simple. Selon un procédé de faisceau secondaire, un balayage est effectué à laide de faisceaux dultrasons de mesure Doppler (42) comme faisceaux primaires, et des composants de mesure Doppler sont mesurés sur la base des ondes ultrasonores reçues en provenance de la direction de chaque faisceau dultrasons de mesure Doppler. Ensuite, des ondes dultrasons formant des faisceaux secondaires (58) au niveau dune direction qui coupe la direction des faisceaux dultrasons de mesure Doppler sont envoyées et reçues, et leffet Doppler pour le composant de direction du faisceau se
