With a view to suppressing fretting in a power transmission chain, when a chain straight-line area is seen from a chain widthwise direction W, a flat portion 18 of a first pin 3 of the chain extends in an inclination direction D. A point of intersection P0 is formed by an imaginary line L1 which passes through a center position of an overall height h of the first pin 3 along the inclination direction D intersecting the flat portion. A point of intersection P2 is formed by an imaginary line L2 which passes through a contact portion A0 and which extends in a chain advancing direction X intersecting the flat portion 18 between the point of intersection P0 and one end P1 of the flat portion. When assuming that a distance between the point of intersection P0 and the point of intersection P2 is referred to as h1 and a distance between the point of intersection P2 and the one end P1 of the flat portion 18 is referred to as h2, 0.1·h1≦h2.