PROBLEM TO BE SOLVED: To provide a simple and inexpensive pressure indicator having a small dimension as a device for one time use.SOLUTION: A pressure indicator includes: a pedestal 2； a deformable film 3 fixed to the pedestal in a liquid-tight state according to a closed outer shape 6； a main body 4 fixed to the pedestal and surrounding at least the closed outer shape while partitioning a hollow volume part covering the deformable film at the side opposite to the pedestal； and at least one entrance inlet 5. Dilation E of the deformable film against a pressure range becomes detectable by a naked eye which is sufficient for a direct display for indicating the pressure. The pedestal is bored with at least one first hole 7, and a first end part of the first hole appears between the deformable film and the pedestal in the closed outer shape. The main body is bored with at least one second hole 8, and a first end part of the second hole appears in the hollow volume part. The other end part of the first hole is connected to the entrance inlet or the outside air, and the other end part of the second hole is connected to the outside air or the entrance inlet.SELECTED DRAWING: Figure 1【課題】単回使用のデバイスとして、小さい寸法を有する簡単で安価な圧力指示器を提供する。【解決手段】台座２と、閉じた外形６に従って液密状態で台座に固定された変形可能な膜３と、台座に固定され、台座とは反対側で変形可能な膜を覆う中空の容積部を区切りながら少なくとも閉じた外形を取り囲む本体４と、少なくとも１つのエントランス入口５とを備え、圧力範囲に対する変形可能な膜の膨張Ｅが、裸眼で検出可能になり、圧力を示す直接表示を可能にするのに十分であり、台座に少なくとも１つの第１の孔７があけられ、第１の孔の第１の端部が、閉じた外形内で変形可能な膜と台座との間に現れ、本体に少なくとも１つの第２の孔８があけられ、第２の孔の第１の端部が、前記中空の容積部内に現れ、第１の孔の他方の端部が、エントランス入口に、または外気に連結され、第２の孔の他方の端部が、外気に、またはエントランス入口に連結される。【選択図】図１
