To provide an agitating apparatus that makes it possible to obtain polymer particles having a large particle size consistently in a high yield without using special additives.

In this agitating apparatus 2, a rotation axis 3 is located vertically. Plural agitating blades 4, 5 are fixed at plural heights of the axis 3. When the height of the lowermost agitating blade is denoted to be a1, and the height from the bottom of the apparatus to the lower end 4a of the lowermost agitating blade 4 is denoted to be b1, relationship 0<b1≤3×a1 is held. When the height of the uppermost blade 5 is denoted to be a2, and the distance from a liquid surface 6 to the lower end 5a of the blade 5 is denoted to be b2, relationship (a2)/2≤b2≤2×(a2) is held.