A dual-stage air bag module for a passenger seat capable of easily controlling and changing gas pressures to be provided into an air cushion, and also implementing a miniaturization and a lightweight of the air bag module. The first and second inflators, which are controlled by a control unit, are arranged in a diagonal direction to each other within a housing. The first and second inflators are generally inflators for a driver seat air bag modules mounted in a steering wheel. The retainer is fixed in the state that a portion thereof is received in the upper portion of the housing in order to fix the cushion holder assembled with the air cushion within the housing. The retainer is coupled through a predetermined coupling member to the housing with the first and second inflators. Therefore, in accordance with the present invention, it is possible to properly change capacities of the first and second inflators and use various specifications of the first and second inflators, thereby facilitating control of gas pressures provided into the air cushion by the inflators and decreasing an air bag module in its size and weight, by adopting the inflator for a driver seat air bag having a relatively small capability as an inflator for a passenger seat air bag.