PURPOSE: To reduce in-service of a nurse by informing of the completion of dosing a liquid medicine to a nurse station wireless when a dripping is performed to a patient.

CONSTITUTION: A medicine liquid is fed to a dripping needle 10 at the tip of a tube 9 therethrough from the bottom of a bottle 5 holding a medicine 4 for dripping. The bottle 5 is hung on a stand 11 through a weight detection sensor 7 to detect the presence of a medicine liquid by a change in the weight thereof and the results are sent by a wireless signal to a nurse station together with identification information. A detection sensor 7 is provided with a spring and a metal needle provided at the tip thereof and as the tip of the metal needle moves with a change in the weight of medicine liquid, when the tip of the metal needle reaches a specified position, it contacts a metal plate to run a current and a change in the weight of the medicine liquid is detected. Thus, burden of a nurse is reduced and the dripping needle 10 can be pulled off immediately after the completion of the dosing thereby enabling a reduction in pains of a patient.