A washer includes a first washer piece formed in a circular arc shape and formed with a first fitting portion that protrudes from one end in a circular arc direction; and a fourth washer piece formed with a second fitting portion that is recessed from one end in the circular arc direction and fitted with the first fitting portion. The first fitting portion and the second fitting portion are fitted in a state where approach and separation therebetween in the circular arc direction is controlled. One of the first fitting portion and the second fitting portion includes a crimped portion that is formed in a state where a side surface of the one of the fitting portions is pushed into a side surface of the other of the fitting portions, the one of the fitting portions being fixed to the other of the fitting portions by the crimped portion.