<p>[PROBLEMS TO BE SOLVED] To provide a chain in which the ease of the caulking of a pin and displacement of the chain is improved and cost reduction is possible. [MEANS FOR SOLVING THE PROBLEMS] In a roller chain 1 in which an inner link 5 formed by press-fitting both end portions of a pair of bushes 4 having rotatable rollers 3 into bush press-fitting holes of a pair of inner plates 2 and an outer link 8 formed by press-fitting both end portions of a pair of pins 7 into pin prese-fitting holes of a pair of outer plates 6 are connected to each other by the pins 7, which penetrate through the bushes 4 and protruded end portions of the pin 7 are caulked, end surfaces of a thin wall thickness hollow cylindrical portion 7a formed on the protruded both end portions of the pin are axially caulked so that annular bulge portions 7c each having a substantially arc cross section are formed on the outer diameter side of the hollow cylindrical portion 7a and convex portions 7e (caulked marks) each having a V-shaped cross section are formed on both end surfaces of the hollow cylindrical portion 7a on pitch lines 9 obtained by connecting the centers of end surfaces of a plurality of said pins 7.</p>
