There are provided a side air bag device, an occupant protection device and an occupant protection method. The side air bag member is expanded between a side door and a passenger M in a widthwise direction of a vehicle so as to protect the passenger from a shock caused by an impact on the side door. The side air bag member includes a communication chamber and a non-expanded portion that are contracted when the side air bag member is pressed by a curtain air bag member that is expanded above the side air bag member in the vertical direction of the vehicle.
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