Bait dispensing device for use in sport fishing, adapted to be cast with a line and to open by interacting with water, to allow dispensing of bait, comprising: - a container sub-divided into a plurality of sectors and adapted to house within it said bait during the cast and to open by interacting with the water, - means of fastening said container to said line; - reversible closing means for said container, using a force of attraction of an active magnetic field between said sectors along their joint planes; characterized in that: - said container is sub-divided into at least four sectors (13, 23, 33, 43) shaped as "segments", adapted to separate fully from one another as a result of interaction with the water; - said means of fastening said container to said line comprise at least four flexible filiform elements (14, 24, 34, 44) of the same length, each having two ends (14', 14", 24', 24" 34', 34" 44', 44"), where each first end (14', 24', 34', 44') is associated with one of said sectors, and each second end (14", 24", 34", 44") is associated with the second ends of the other filiform elements, and together can be associated with said line; - said bait dispensing device further comprises movement limiting means for said sectors (13, 23, 33, 43) when said bait dispensing device is in the open configuration, where said movement limiting means comprise: - an elongated core around which said flexible filiform elements (14, 24, 34, 44) are arranged; - a truncated cone-shape wedge that can slide along said core; and - a compression-operated helical spring fitted onto said core; where said wedge, in the bait dispensing device open configuration, is free to slide along said core towards the outside of said container, due to the effect of the release action of said helical spring, acting as a movement limiter for said sectors (13, 23, 33, 43). - a container sub-divided into a plurality of sectors and adapted to house within it said bait during the cast and to open by interacting with the water, - means of fastening said container to said line; - reversible closing means for said container, using a force of attraction of an active magnetic field between said sectors along their joint planes; - said container is sub-divided into at least four sectors (13, 23, 33, 43) shaped as "segments", adapted to separate fully from one another as a result of interaction with the water; - said means of fastening said container to said line comprise at least four flexible filiform elements (14, 24, 34, 44) of the same length, each having two ends (14', 14", 24', 24" 34', 34" 44', 44"), where each first end (14', 24', 34', 44') is associated with one of said sectors, and each second end (14", 24", 34", 44") is associated with the second ends of the other filiform elements, and together can be associated with said line; - said bait dispensing device further comprises movement limiting means for said sectors (13, 23, 33, 43) when said bait dispensing device is in the open configuration, where said movement limiting means comprise: - an elongated core around which said flexible filiform elements (14, 24, 34, 44) are arranged; - a truncated cone-shape wedge that can slide along said core; and - a compression-operated helical spring fitted onto said core; - an elongated core around which said flexible filiform elements (14, 24, 34, 44) are arranged; - a truncated cone-shape wedge that can slide along said core; and - a compression-operated helical spring fitted onto said core;