ROCKER ARM AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a method of manufacturing a rocker arm, in which a shaft hole is formed in a state of properly keeping relationships of a first connecting part and a second connecting part to the shaft hole, without lowering strength of a position for forming the shaft hole. SOLUTION: The rocker arm has a pair of side wall parts 13 formed to be opposite to each other and a first connecting part 11 and a second connecting part 12 connecting the pair of the side wall parts 13, respectively. The first connecting part 11 and the pair of side wall parts 13 form an approximately U-shaped section. Each of side wall parts 13 has a projecting part 131 projecting toward a bottom part side 101 of an approximately U-shaped section and a shaft hole 15. The whole board thickness (t) of the projecting portions 131 is approximately uniform and the projecting amount H is 80% or more of a value calculated by subtracting the board thickness (t) of the projecting parts 131 from spacing W between inner faces 136.