Air bed with stable supporting structure

An air bed with a stable supporting structure, comprising a periphery sheet, a top sheet, a bottom sheet, a middle sheet which separates an air bed into an upper air-chamber and a lower air-chamber, a loop of outer extending strip provided in the upper air-chamber which separates the upper air-chamber into a peripheral air-chamber and an upper main air-chamber, and a first set of extending strip which is provided in the upper main air-chamber and consists of a plurality of parallel extending strip;

• characterized in that the air bed with a stable supporting structure further comprising a second set of extending strip which is provided in the lower air-chamber, and which includes a plurality of parallel extending strips, and is welded with the middle sheet and the bottom sheet, and an oblique extending strip which is provided around the second extending strip and is welded with the periphery sheet and the bottom sheet to separate the lower air-chamber into a lower main air-chamber and a peripheral auxiliary air-chamber;
• the lower main air-chamber is a space which has a shape of inverse cone and receives air therein, and its outer surface is concave with respect to the outer surface of the peripheral auxiliary air-chamber, that is, the surface of the peripheral auxiliary air-chamber is higher than the surface of the bottom sheet of the lower main air-chamber.