PURPOSE: To deposit and produce an Ni powder with the primary particles having a small average diameter and having a narrow particle size distribution width by specifying the pH value and temp. of an aq. water-soluble Ni salt soln., then adding a reducing agent to the soln. and subjecting the soln. to a reaction.

CONSTITUTION: A water-soluble Ni(II) salt such as nickel chloride is dissolved in water to prepare an aq. Ni salt soln. contg. 1-2mol/l Ni ion, and then a strong alkali such as NaOH is added to control the soln. to ≥pH10. A 1% carboxymethylcellulose soln. as a dispersant is added, as required, by about 1/100 of the total amt., the soln. is heated to 55-70°C, a reducing agent such as hydrazine and hydrazine hydrate kept at 0-70°C is added by 2-10mols per mol of Ni ion while agitating the soln. to reduce the Ni ion, the reduction reaction is finished within 40-110min, and Ni is deposited. A fine nickel powder with the primary particles having 0.4-0.6μm average diameter and having a narrow grain size distribution width is obtained in this way.