To provide an ultrasonic transducer, an ultrasonic probe, and an ultrasonic endoscope which prevent a pitch interval between piezoelectric elements from shifting.SOLUTION: The ultrasonic transducers are formed in a prismatic shape and arranged at predetermined pitch intervals so that longitudinal directions thereof are parallel to each other, and include a plurality of piezoelectric elements for transmitting and receiving ultrasonic waves, an array of the piezoelectric elements An acoustic member joining the piezoelectric element and the connecting portion to each other, a connecting portion connecting the adjacent piezoelectric elements along the direction, the acoustic member joining the piezoelectric element and the connecting portion, And a core member fixed to the connecting portion and having higher rigidity than the connecting portion.(FIG.【課題】圧電素子のピッチ間隔がずれることを防止した超音波振動子、超音波プローブ、及び超音波内視鏡を提供すること。【解決手段】超音波振動子は、角柱状をなし、長手方向が平行になるように所定のピッチ間隔に配列されており、超音波の送受信を行う複数の圧電素子と、前記圧電素子の配列方向に沿って、隣接する前記圧電素子を連結する連結部と、前記圧電素子と前記連結部とを接合する音響部材と、前記圧電素子が超音波の送受信を行う方向と交わらない位置において、前記連結部に固定されており、前記連結部より剛性が高い芯部材と、を備える。【選択図】図3
