To provide a volume controlling device capable of making a drug to smoothly flow down and also capable of preventing the drug from being undesirably leaked and also capable of easily executing an exchanging. incorporating and assembling works of a shutter to suppress a device cost as much as possible.

This device is provided with a passage part 7 in which a supplied matter from a storage tank 2 is flown down and a rotating shutter 11 consisting of an elastomer inserted so as to across the passage part 7 and being in press-contact so as to close the passage part 7. The flow rate of the supplied matter flowing down the passage part 7 is regulated in accordance with a rotating angle of the rotating shutter 11. The rotating shutter 11 is composed of a notched cylindrical matter in which a notched part 12 is formed in the radial direction.