Provided are a puncture needle, an ultrasonic diagnostic device, and a method for controlling an ultrasonic diagnostic device, with which a user can accurately identify the tip of a puncture needle. The puncture needle comprises: a shaft part S； a needle tip part T situated at the tip of the shaft part S； and a plurality of processed parts which are arranged on the periphery of the shaft part S along the length direction of the shaft part S, and which are formed at a placement intervals in a arithmetic sequence that gradually decreases towards the needle tip part T. A placement interval L1 between a first processed part P1, which is the processed part among the processed parts that is closest to the needle tip part and is separate from the needle tip part T by a prescribed distance, and a second processed part P2, which is the processed part among the processed parts that is second closest to the needle tip part, is less than or equal to the common difference of the arithmetic sequence； or the distance from the needle tip part to the first processed part P1, which is closest to the needle tip part, is less than or equal to the common difference of the arithmetic sequence and is equal to the common difference of the placement interval L1 between the first processed part P1 and the second processed part P2, which is second closest to the needle tip part.L'invention concerne une aiguille de ponction, un dispositif d'examen à ultra-sons et un procédé de commande d'appareil d'examen à ultra-sons, lesquels permettent à un utilisateur de saisir avec précision la partie pointe d'une aiguille de ponction. Cette aiguille comporte: une partie tige (S)； une partie pointe (T) d'aiguille située à l'extrémité avant de la partie tige (S)； et plusieurs parties traitées, lesquelles sont situées sur la partie circonférence de la partie tige (S) dans le sens de la longueur de cette partie tige (S), et lesquelles forment une suite arithémique dans laquelle les espaces de disposition ent
