a steering wheel unit for mounting on a steering column of a motor vehicle has a steering wheel including an inner frame with a steering wheel rim and with at least one spoke connected to the steering wheel rim and extending radially inwardly toward a steering column . the steering wheel includes a molded plastic envelope enclosing the inner frame . an air - bag anti - impact device is mounted on the steering wheel . a cap for covering the air - bag anti - impact device is provided . the air - bag anti - impact device has a folded air - bag and a gas producer for inflating the air - bag when tripped . the air - bag has a delimiting edge and is connected with the delimiting edge to the steering wheel to thereby delimit a gas inlet opening for gas produced by the gas producer upon tripping . the cap is opened by the force of the air - bag when being inflated by the gas producer . the molded plastic envelope and the cap are integrally formed so as to define a receiving area for the air - bag anti - impact device , wherein the air - bag anti - impact device is mounted within the receiving area .