An air cell, and others, that are capable of reducing contact pressure at a bony prominence locally projecting from a body and of preventing a “hammocking” effect are provided.An air cell is to be used by arranging the air cell in parallel with an air mattress. The air cell is provided with: a cell that is made of a flexible sheet material, the cell including a first side wall and a second side wall facing each other and being inflated by enclosing air in the interior of the cell； and a connection member that is made of a flexible material, the connection member connecting the first side wall and the second side wall to each other in the interior of the cell at a plurality of locations and suppressing sinking of the air cell in the direction in which a load is applied to the air cell when the air cell is arranged in parallel with the air mattress, wherein the connection member is bonded to each of the first side wall and the second side wall at a plurality of bonding parts.本發明之課題係提供一種氣囊等，即使在由身體局部突出之骨頭突出部也能降低接觸壓力，同時可以防止吊床現象。其解決手段係提供一種氣囊，係並排設置於充氣床墊而使用；該氣囊包括：膨脹之囊體，由具有可撓性的薄片材料形成，具有彼此相向的第1及第2側壁，藉由在內部封入氣體而膨脹；以及連接構件，由具有可撓性的材料形成，並於複數部位而從該膨脹之囊體之內部連接該第1及第2側壁，同時抑制該氣囊在並排設置於充氣床墊的狀態下在對該氣囊施加荷重之方向下沉，該連接構件，係於複數個接合部而接合於第1及第2側壁之雙方。
