An assembly method for a power transmission chain including first to n-th link plates (2A, 2B, 2C, 2D) and first to (n - 1)-th pin members (3A, 4A, 3B, 4B, 3C, 4C), n being an integer of four or greater, wherein each of the first link plates has a pair of first pin holes, the first link plates are disposed in an outermost row on one side in a chain-width direction and arranged at prescribed intervals in a chain-travelling direction, one end portions (31A, 41A) of the first pin members (3A, 4A) are press-fitted into the first pin holes, the first pin members (3A, 4A) are arranged at prescribed intervals in the chain-travelling direction, each of the k-th link plates (2B, 2C) has a pair of k-th pin holes (5B, 5C), k being integers of two to (n - 1), the k-th link plates (2B, 2C) are placed adjacent to and stacked on the other side of the (k - 1)-th link plates (2A, 2B) in the chain-width direction and arranged at prescribed intervals in the chain-travelling direction, one end portions (31 B, 41 B, 31C, 41 C) of the k-th pin members (3B, 4B, 3C, 4C) are press-fitted into the k-th pin holes (5B, 5C), the k-th pin members (3B, 4B, 3C, 4C) are arranged at prescribed intervals in the chain-travelling direction, each of the n-th link plates has a pair of n-th pin holes, and the n-th link plates are stacked in an entire region on the other side of the (n - 1)-th link plates in the chain-width direction so as to form multiple layers, the assembly method comprising the steps of: (a) assembling a first connected body including a pair of the first pin members (3A, 4A) and the single first link plate by press-fitting the single first link plate onto the one end portions (31A, 41A) of the first pin members (3A, 4A) until the first link plate comes into contact with a first reference surface that is a top face of a first connected body assembly jig in a state where portions (32A, 42A) of the pair of first pin members (3A, 4A) other than the one end portions (31A, 41A) are inserted into and held in a pair of first holding holes (82A, 83A) that are open at the first reference surface and that extend in a direction perpendicular to the first reference surface; (b) assembling a k-th connected body (6B, 6C) including a pair of the k-th pin members (3B, 4B, 3C, 4C) and the single k-th link plate (2B, 2C) by press-fitting the single k-th link plate (2B, 2C) onto the one end portions (31 B, 41 B, 31C, 41 C) of the k-th pin members (3B, 4B, 3C, 4C) until the k-th link plate (2B, 2C) comes into contact with a k-th reference surface (84B, 84C) that is a top face of a k-th connected body assembly jig (8B, 8C) in a state where portions (32B, 42B, 32C, 42C) of the pair of k-th pin members (3B, 4B, 3C, 4C) other than the one end portions (31B, 41B, 31C, 41 C) are inserted into and held in a pair of k-th holding holes (82B, 83B, 82C, 83C) that are open at the k-th reference surface (84B, 84C) and that extend in a direction perpendicular to the k-th reference surface (84B, 84C); and (c) assembling the first to (n - 1)-th multiple connected bodies (6A, 6B, 6C) by repeatedly performing the steps (a) and (b), and then assembling the power transmission chain from the first to (n - 1)-th multiple connected bodies (6A, 6B, 6C) and the multiple n-th link plates. (a) assembling a first connected body including a pair of the first pin members (3A, 4A) and the single first link plate by press-fitting the single first link plate onto the one end portions (31A, 41A) of the first pin members (3A, 4A) until the first link plate comes into contact with a first reference surface that is a top face of a first connected body assembly jig in a state where portions (32A, 42A) of the pair of first pin members (3A, 4A) other than the one end portions (31A, 41A) are inserted into and held in a pair of first holding holes (82A, 83A) that are open at the first reference surface and that extend in a direction perpendicular to the first reference surface; (b) assembling a k-th connected body (6B, 6C) including a pair of the k-th pin members (3B, 4B, 3C, 4C) and the single k-th link plate (2B, 2C) by press-fitting the single k-th link plate (2B, 2C) onto the one end portions (31 B, 41 B, 31C, 41 C) of the k-th pin members (3B, 4B, 3C, 4C) until the k-th link plate (2B, 2C) comes into contact with a k-th reference surface (84B, 84C) that is a top face of a k-th connected body assembly jig (8B, 8C) in a state where portions (32B, 42B, 32C, 42C) of the pair of k-th pin members (3B, 4B, 3C, 4C) other than the one end portions (31B, 41B, 31C, 41 C) are inserted into and held in a pair of k-th holding holes (82B, 83B, 82C, 83C) that are open at the k-th reference surface (84B, 84C) and that extend in a direction perpendicular to the k-th reference surface (84B, 84C); and (c) assembling the first to (n - 1)-th multiple connected bodies (6A, 6B, 6C) by repeatedly performing the steps (a) and (b), and then assembling the power transmission chain from the first to (n - 1)-th multiple connected bodies (6A, 6B, 6C) and the multiple n-th link plates.