A motorcycle airbag module includes an inflatable airbag, which is deployed between the rider's seat and the steering handlebar of a motorcycle. First and second recessed portions are formed in the front face of the airbag, when in an inflated and deployed state. The first recessed portion extends in a longitudinal direction in the center part of the front face and the second recessed portion diverges and extends respectively to the right and left from the lower end of the first recessed portion arranged in the longitudinal direction. The front face of the airbag is sectioned by the first and second recessed portions to form right and left inflated portions as well as a lower inflated portion. The right and left inflated portions are positioned respectively on the right and left sides of the first recessed portion, and the lower inflated portion is positioned below the second recessed portions.