transmission can be improved the oscillation of the inner link plate 130 that would otherwise be transmitted to the connecting pin 140 is absorbed by the radial gap r 1 between the connecting pin 140 and the through hole 136 because the connecting pin 140 is loosely fitted through the through hole 136 therefore compared to the oscillation of a thickness of an oil film between a bushing and a roller in a roller chain having bushings fixed to its inner link plates it is possible to achieve a greater suppression of the oscillation of the thickness of the oil film f between the connecting pin 140 and the roller 150 moreover it is possible to stabilize the impact reducing effect brought about by the oil film f i e the impact applied by the sprocket teeth to the rollers and the connecting pins when the rollers starts to engage with the sprocket teeth as a result it is possible to reduce the noise otherwise caused by the impact of the sprocket teeth and the rollers and to improve the durability of the rollers and the connecting pins and the overall durability of the chain because the inner link plate 130 oscillates when the contact portion 134 slides on sliding contact surfaces 114 and 118 the region where the contact portion 134 contacts surfaces 114 and 118 and the region where the connecting pin 140 contacts the inner surface 137 of the through hole 136 are dispersed therefore it.