Abstract: A sonic sinker connected to a fish line of a fishing tackle in order to positively and selectively fish up black bass. The sonic sinker comprises a sinker main body formed of free cutting brass. An air chamber maintaining a water-tight seal is formed inside the sinker main body. A pipe-shaped section is provided within the air chamber and extending vertically to across the air chamber. A ring-shaped member is movably disposed with the air chamber and located around the pipe-shaped section so as to be vertically and laterally movable. The ring-shaped member is formed of free cutting brass and strikable against the inner wall of the sinker main body upon vibration of the sinker main body, thereby generating melodious sound to be emitted outside of the sinker main body.