An embodiment of the present invention includes: a pump part that delivers and administers a drug solution held in a reservoir to a live body； a flow rate sensing part that senses the flow rate of the solution delivered by the pump part； and a drive unit that controls the drive state of the pump part based on the sensed flow rate. The flow rate sensing part includes: a heat-generating element disposed in a conduit line in which the drug solution is delivered； a first temperature sensing element disposed in the conduit line upstream of the heat-generating element； a second temperature sensing element disposed in the conduit line downstream of the heat-generating element； and an arithmetic processing unit that calculates the flow rate within the conduit line based on the difference between the temperatures sensed by the first and second temperature sensing elements.
