The invention discloses the structure of a pressure indicator. The pressure indicator comprises an upper cover, a middle component, an elastic pressure induction membrane, a transmission indicating rod and a lower cover, wherein a one-way valve is arranged inside the upper cover, the outer wall of the upper cover and the one-way valve jointly form an upper opening, the upper cover and the middle component jointly form an 
atmosphere channel communicated to the 
atmosphere, the lower port of the middle component is glued to the 
peripheral flange of the elastic pressure induction membrane, the elastic pressure 
inductance membrane structure is designed to be a circular slice and is 0.1mm-2.0mm in width, the lower surface of the elastic pressure induction membrane is provided with a groove matched with the supporting end of the transmission indicating rod which comprises the supporting end, a connecting rod, holes and an indicating end, and the elastic pressure 
inductance membrane is provided with an annular reinforcing rib and a longitudinal reinforcing rib which are made of rubber or 
silicon rubber or TPE or other high-elasticity 
polymer materials. The pressure indicator is wide in pressure indicating range, high in accuracy, visual, capable of being matched with equipment provided with an air bag or a water bag for use, and especially suitable for 
laryngeal masks, trachea cannulas, urinary catheters and other 
medical instruments.