To continuously and efficiently ultra-finely pulverizing a fluid material to be treated in a short time down to a desired size of a micron order when necessary.

An ultra-finely pulverizing device 1 is provided with a pair of disks 11, 12 separately installed opposite to each other so as to form an ultra-finely pulverizing chamber 5 between the two and relatively rotating around a common center axis x, a motor M1 driving the disk 12 at a relative rotating speed of 500-1,000 rpm through one of supporting shafts 11A, 12A attached to the outer side of the circular disks along the center axis, a supply part 13 supplying a fluid W to be treated into the ultra-finely pulverizing chamber through the other of the supporting shafts, protruding parts 11C, 12C protruding from the inner surfaces of the disks in the state of avoiding collision with each other during rotation and a discharging part 15 discharging an ultra-finely pulverized product from the ultra-finely pulverizing chamber after the fluid clusters and floating matters of the fluid to be treated introduced into the ultra-finely pulverizing chamber are ultra-finely pulverized down to the desired size by agitation of the protruding parts caused by relative rotation of the disks.

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