An inflatable bed is adapted for use with a sofa, and includes an upper inflatable pad unit disposed on and connected to a lower inflatable pad body, and having a bridging unit that is misaligned from the lower inflatable pad body in a vertical direction and that has a bottom surface adapted to face a seat surface of the sofa when the bridging unit is disposed on the seat surface of the sofa. Two auxiliary inflatable pad bodies are attached respectively on opposite lateral ends of the bridging unit of the upper inflatable pad unit. Each auxiliary inflatable pad body is adapted to fill a space between the bridging unit of the upper inflatable pad unit and a corresponding arm of the sofa when the bridging unit of the upper inflatable pad unit is disposed on the seat surface of the sofa.