Abstract: There is provided a medical device, especially an indwelling needle with a branch tube, in which the construction is simple, the operation can be performed easily in a short period of time, and misoperation is less liable to occur, thus a medical accident being less prone to take place. In the medical device, a first case portion fitted with a check valve therein and provided with a flexible portion having a pressing button and a second case portion connecting with the first case portion on the inflow side of the check valve are separate parts. The medical device is characterized by having a branch tube which extends to the side of the second case portion and the interior of which communicates with the hollow portion of the second case portion.

Abstract: A blood collecting device according to the present invention is a blood collecting device, wherein a columnar liquid absorber, which contains a blood coagulation preventing solution, has a slit, and temporarily absorbs a predetermined amount of blood without coagulation is disposed at a tip end, and a pressing body which presses a rear surface of the liquid absorber to separate the liquid absorber is provided.