In order for a core metal member having three spoke parts to be usable in a three-spoke steering wheel and a two-spoke steering wheel having one fewer spoke part than the three-spoke steering wheel, one of the spoke parts of the core metal member is a separable spoke part, which is separable along separation marks provided on vertical spokes forming the separable spoke part. Each vertical spoke constituting the separable spoke part is provided with an indented first fragile portion and an indented second fragile portion which also act as the separation marks.