PROBLEM TO BE SOLVED: To provide a medical suction device capable of easily sucking drainage liquid by easily adjusting the suction speed and suction amount of drainage liquid. SOLUTION: The medical suction device includes a negative pressure container, an exhaust unit (exhaust member 4) capable of exhausting air to the outside to make the negative pressure container a negative pressure, a negative pressure container and an exhaust member 4. And a negative pressure container side one-way valve 8 disposed between the exhaust gas side and the exhaust member 4 and an exhaust part side one-way valve 7 disposed between the exhaust member 4 and the outside. The one-way valve 8 on the negative pressure container side allows the exhaust member 4 to exhaust air from the negative pressure container to the exhaust member 4 when the exhaust member 4 is restored from the second state to the first state, and at the same time, allows the negative pressure container to move from the negative member. Block intake to. The one-way valve 8 on the negative pressure container side is configured such that drainage is sucked by the medical suction device and the pressure of the negative pressure container is increased, so that the negative pressure container moves to the exhaust member 4 even when the exhaust member 4 is in the first state. Allow air to be exhausted to. [Selection diagram] Fig. 4【課題】排液の吸引速度及び吸引量を調整することが容易で、効率よく排液を吸引可能な医療用吸引器具を提供する。【解決手段】医療用吸引器具は、陰圧容器と、外部にエアを排気して陰圧容器を陰圧にすることが可能な排気部（排気部材４）と、陰圧容器と排気部材４との間に配置された陰圧容器側一方弁８と、排気部材４と外部の間に配置された排気部側一方弁７と、を備える。陰圧容器側一方弁８は、排気部材４が第２状態から第１状態に復元する際に、陰圧容器から排気部材４へのエアの排気を許容しつつ、排気部材４から陰圧容器への吸気を阻止する。陰圧容器側一方弁８は、排液が医療用吸引器具に吸引されて陰圧容器の圧力が高まることにより、排気部材４が第１状態にあるときにも、陰圧容器から排気部材４へのエアの排気を許容する。【選択図】図４
