Problem to be solved: to provide an air balloon for a blood pressure meter which does not cause the intake failure due to washing.Solution: in a telescopic hollow balloon (20) used in a manual blood pressure gauge, a side connected to the body (10) of the blood pressure gauge as the tip end (21) is used as the tip end (21), an air intake port (24), an intake port (25), an intake blocking material (50, 70) for stopping an intake from the intake port, and said air outlet A reverse flow preventive member (60) for preventing return of the air supply is disposed, and the air inlet and the intake port are arranged concentrically.This prevents the intake air from occurring in the end portion 22 of the balloon.Diagram【課題】洗浄による吸気不良が生じない血圧計用送気球を提供する。【解決手段】手動式血圧計に用いられる、伸縮可能な中空の送気球(20)において、前記血圧計の本体(10)に接続される側を先端部(21)とし、前記先端部に、送気口(24)、吸気口(25)、前記吸気口からの吸気を止める吸気遮断材(50,70)、前記送気口からの送気の戻りを防止する逆流防止材(60)が配置され、前記送気口と前記吸気口は、同心円状に配置される。これにより、送気球の末端部(22)で生じる吸気不良を防止することができる。【選択図】図5