One folding type air bed is arranged to connect an extending device and one bag, below an airbed, is used by extension extending device and is received into bag by folding extending device when it is not used. Folding type air bed includes an airbed and an extending device (5). Extending device (5) includes multiple central frame (10), wing frame (20) and extending frame (30). Central frame (10) is coupled below airbed, and it is narrower to be formed to have width than airbed. On the both ends of central frame (10), wing frame (20), which is coupled, to be folded with internal direction, support the twolip of simultaneously foldable inflating mattress. Extending frame (30) is coupled with the both sides of central frame (10).
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