An object of the present invention is to provide a silent chain which suppresses vibration and undulation while maintaining rigidity, strength, and durability and simplifying a shape of a pin hole without using a locker pin with a special shape and special material. In a silent chain 100, a guide row 101 made up of guide plates 110 and a middle plate 120 and a non-guide row made 103 made up of inner plates 130 are alternately connected in a chain longitudinal direction by a pair of locker pins 140 and 150. Pin holes 121 and 131 respectively have outer peripheral side straight portions 123 and 133 and inner peripheral side straight portions 124 and 134 which are formed parallel to each other.