A fluid pump for circulating the cooling liquid to cool the heat-generating part is disclosed. The fluid pump includes a case including a
pump chamber for storing a liquid, a suction port and a
discharge port provided on the case so as to communicate with the
pump chamber, an
impeller having pump vanes and rotatably placed in the
pump chamber, which suctions a liquid into the pump chamber via the suction port and discharges the liquid out of the pump chamber via the
discharge port by rotation, a motor for driving the
impeller, installed in the case and having a
stator and a rotor to which the
impeller is integrally attached for rotating together, a reserve tank for storing spare liquid located and formed in the case but outside the pump chamber, a fluid path forming member arranged inside the reserve tank, including a
discharge path communicating between the discharge port and the pump chamber, and a communication hole formed in the fluid path forming member so as to communicate between the discharge path and inside of the reserve tank.