To provide a fluid stirring apparatus which can suck in materials strongly to the inside by using an impeller, at the same time, can form a strong vertical direction flow in a stirring tank by giving strong ejected energy to a discharge fluid, and carries out a uniform mix stirring of bentonite and water over the whole stirring tank.

The fluid stirring apparatus 11 comprises a lower part stirring mechanism 13 consisting of an impeller casing 18 provided with a suction mouth 16 on the lower surface and at the same time, a plurality of discharge mouths 17 radially on the periphery, an impeller arranged freely rotatably in the impeller casing 18, and a fluid stirring pump having a rotary motor provided by following the impeller casing 18 and capable of rotating the impeller, and an upper part suction-stirring mechanism 14 consisting of an impeller casing 21 arranged on the upper part of the stirring tank 10, and provided with a suction mouth 19 on the upper surface and a discharge mouth 20 radially on the periphery, an impeller arranged rotatably in the impeller casing 21, and a fluid stirring pump having a rotary motor arranged by following the impeller casing 21 and capable of rotating the impeller.