We make an attempt to quantify directly the latitudinal profile of the solar wind velocity around equatorial low-speed region, based on observations made by Sakigake, Suisei, and IMP 8 between March 1986 and April 1987, without using the assumption that the location of the minimum velocity just coincides with that of the neutral sheet. We use the formula V(km/s) =A sin2 (ϕ-ϕA)+B, to parametarize the latitudinal profile. A and B are found to be 1500--11,000 km/s and 340--400 km/s, respectively, which means that the angular width of the low-speed region below 500 km/s is about 17¿. These values also indicate the latitudinal velocity gradient of 30 km/s/deg at the portion of velocity of 500 km/s; ϕA, the latitude of the minimum velocity, oscillated sinusoidally around the solar equation as a function of longitude. The amplitude of the sinusoidal oscillation was 4¿--9¿ in 1986 and 1¿--2¿ in early 1987. These amplitudes are smaller than the tilt angle of the neutral line calculated from the photospheric magnetic field. ¿ American Geophysical Union 1989