A steering wheel is provided having a vibration prevention mechanism and a horn switch mechanism, the horn switch mechanism includes: first and second contact plates each having two contacts for operating a horn; coil springs provided between the first and second contact plates to space them away from each other; and guide pins for guiding the movement of the contact plates towards each other. The vibration prevention mechanism includes a mounting plate; two vibration proofing rubber members provided between the mounting plate and the second contact plate to couple the mounting place to the second contact plate. The two contacts of the first contact plates, the two contacts of the second contact plates, and the two vibration proofing members are located in one and the same plane. This arrangement allows the operator to operate the horn smoothly.