To provide a silent chain transmitting device, in which power is securely transmitted from a driving side sprocket wheel to a driven side sprocket wheel while securing smooth rotation.

A pair of link plates 31A and 31B adjoining each other cooperate to form a single tooth part 39. Adjoining tooth parts 39 are relatively rotatably connected through a connection member 37. Adjoining link plates 71A and 71B are pin-connected to a connection member 90 to be relatively rotatable. In each of the link plates 71A, 71B, etc., an outside pin hole 72 is formed at one end part, a center pin hole 73 is formed, and a tooth part 74 is formed in an arc shape, centered to a center e of the center pin hole, and in radius ρ that is smaller than center-to-center distance P of both pin holes 72 and 73.