An object of the present invention is to provide a blood collecting device capable of collecting blood in a short time after puncture is performed while the blood is not scattered to open air other than a container for collecting the blood. Furthermore, the object is to provide a blood collecting device capable of collecting blood in a short time after puncture is performed while the blood is not scattered to open air other than a container for collecting the blood.In order to achieve the above-described object, the present invention is achieved as follows. One of representative blood collecting devices according to the present invention includes a container unit that includes a screw portion, a holder that holds the container unit serving as a system whose one end is closed, a puncture unit that can be attached to the container or the holder, a through-hole of the puncture unit, and a puncture unit protection member that protects the puncture unit and the container unit.
