PURPOSE: To obtain fine particle-shaped acicular TiO2 having satisfactory dispersibility by burning a mixture of fine particles of rutile type TiO2 with an alkali metal source and an oxy-phosphorus compd. so that particles each having a specified minor axis size and a specified major axis size are formed.

CONSTITUTION: A mixture is prepd. by wet-mixing 100 pts.wt. Ti source such as fine particles of rutile type TiO2 having 20-120m2/g specific surface area with about 10-200 pts.wt. alkali metal source such as NaCl and about 0.01-20 pts.wt. oxy-phosphorus compd. such as Na2P2O-10H2O. This mixture is spray- dried with a spray drier, etc., and burnt at about 700-1,000°C in which the percentage of particles particle-shaped acicular TiO2 in which the percentage of particles each having ≤0.2μm minor axis size and ≤2μm major axis size is practically 100% and that of particles each having 0.03-0.1μm minor axis size and 0.2-1.0μm major axis size is ≥95%.