The drug delivery device is a first container, and the first container has a delivery outlet at the front end thereof and a first stopper that is axially movable within the first container. The stopper defines a first chamber and a second chamber in the first container and is separated from each other, the first chamber being located axially forward of the first stopper； The second chamber includes a first container positioned axially rearward of the first stopper. The drug delivery device is a second container, and the second container has a second stopper that is axially movable in the second container, and the second stopper is a second container. A third chamber and a fourth chamber are defined in the container and separated from each other, the third chamber is located axially forward of the second stopper, and the fourth chamber is The third chamber further includes a second container located axially rearward of the two stoppers and having a vent outlet in fluid communication with the discharge chamber. The first stopper is connected to the second stopper by a tension member, so that the axial forward movement of the first stopper is caused by the tensile movement of the first stopper. Has come to bring. The first stopper is drivable axially forward and the first chamber is configured to contain a drug that is delivered through the delivery outlet when the first stopper moves axially forward. And the third chamber contains viscous fluid that enters the discharge chamber through the vent outlet when the second stopper moves axially forward, and the fourth chamber has a pressure of the discharge chamber. It has a pressure that is substantially equal or higher. When the first stopper is driven axially forward, the tension member is pulled, moving the second stopper axially forward, and the discharge of the viscous fluid into the discharge chamber via the vent outlet is The axial forward movement of the stopper and the first stopper will be delayed.薬剤送達装置は、第１の容器であ
