To provide a bridge formation assisting device for billiards, not so conspicuous, hardly giving a sense of incongruity, simplifying attachment and detachment, hardly causing sweat and dirt, usable without feeling resistance, and facilitating fine adjustment for forming a correct shape of a bridge.

The bridge formation assisting device for a billiard includes: a user's middle finger applied part 10 applied to a place between the first joint and the second joint in his middle finger; and a knob part 20 projected outward from the middle finger applied part 10 to be picked between the inside surface of his thumb and the inside surface of his index finger. The middle finger applied 10 is formed ring-shaped or C-shaped to insert his middle finger, and the tip of the knob part 20 is provided with a stopper 30 formed to hold his thumb and index finger in predetermined positions.

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