To elongate service life by relaxing a concentration stress generated in links.

A power transmission chain 1 has: a plurality of links 2 having first and second through holes 4a, 4b; a plurality of pin members 3, 5 inserted into the through holes 4a, 4b and fixed to the links 2 to mutually connect the plurality of links 2. A stress relaxing hole 6 is formed in at least one of two intersection parts 2d where a column part 2a formed between through holes 4a, 4b of the link 2 intersects with two long side parts 2b formed to be continuous to both end parts of the column part 2a in a longitudinal direction of the link.