A medicinal-solution administration system feeds a medicinal solution to a mammal including a human and includes a medicinal-solution feed device (1) that feeds a medicinal solution, an observation device (9) that includes an elongated observation probe (7) and observes a diseased part to which the medicinal solution is administered, and a medicinal-solution administration cannula (C) that has at least a part thereof implanted in a body, and the medicinal-solution administration cannula (C) guides the medicinal solution, which is fed from the medicinal-solution feed device (1), and the observation probe (7) to the diseased part. Thus, it is possible to achieve a medicinal-solution feed system and a medicinal-solution feed cannula that can reduce the burden, such as irradiation, on a patient and easily perform checking of the effect of the anticancer-agent administration.
