Airbag for steering wheel

An airbag for steering wheel configured to allow an inflation gas to flow therein to inflate so as to cover an upper surface side of a ring part of a steering wheel, and comprising a vehicle body-side wall part to be arranged at a steering wheel side and a driver-side wall part to be arranged at a driver side upon completion of the inflation, wherein

• outer peripheral edges of the vehicle body-side wall part and the driver-side wall part of which outer shapes are made to substantially coincide with each other are joined such that the airbag is formed to have a bag shape, and an inlet opening which is opened so as to allow the inflation gas to flow therein and of which a peripheral edge is attached to the steering wheel side is arranged at a vicinity of a center of the vehicle body-side wall part,
• the vehicle body-side wall part is formed with a concave part to be concave upward toward the driver-side wall part upon completion of the inflation so that a rear part-side region of the ring part can be entered into the concave part, and
• the concave part is arranged at the vehicle body-side wall part so that the ring part is entered into the concave part when a driver is received by the airbag upon completion of the inflation.