There is a concern that a mechanical switch could be switched OFF due to movement of a body in which the switch is embedded. If the switch is switched OFF after being embedded, it is difficult to switch the switch back ON. Provided is a fluid delivery device that is used by being embedded within a body, including a fluid delivery mechanism for discharging fluid from a reservoir that contains the fluid to outside of the reservoir a sending and receiving section that sends and receives information relating to control of the fluid delivery mechanism to and from an external apparatus a power supply section that supplies power to at least one of the fluid delivery device and the sending and receiving section and a mechanical switch that is capable of changing a supply path of the power only from a cutoff state to a conductive state. Also, the fluid delivery device may have the following aspects. Ribs for guiding the external elastic tube are provided on an outer circumferential surface of the chassis. The connecting section is provided at a linear portion of the chassis, which has an ovular shape when seen from a top surface direction of the reservoir. The connecting section is provided within a concave portion formed in the linear portion. An internal elastic tube that delivers the fluid flowing therethrough and is pressed out by the fluid delivery mechanism, from the reservoir to the connector, but is not pressed until the fluid delivery device is used by being embedded, is arranged along an inner circumference of the ovular shape. The connecting section and the fluid injection port that receives the fluid to be replenished in the reservoir are arranged in a line along a replenishing direction of the fluid in the chassis.
