An inflatable air mattress device includes a cover internally defining a first and a second receiving zone for receiving a pump and an air mattress therein, respectively. The air mattress includes a plurality of parallelly arranged air cells, each of which internally includes a first air chamber located below a second air chamber and having an elastic member provided therein. The pump is held in the first receiving zone via a movement-limiting mechanism and is provided with an air input and an air release line for communicably connecting to each of the air cells. Since the air cells, the pump and the air input and release lines all are arranged inside the cover, the inflatable air mattress device has an esthetic appearance and occupies less space. The elastic members in the first air chambers prevent a user from contacting with a hard bed frame when the air cells are deflated.
