PURPOSE: To manufacture the title steel sheet having excellent press formability in the sheet width edge part by executing specific hot rolling, coiling and continuous annealing to a steel having specific compsn. constituted of C, Si, Mn, P, S, Al and Fe.

CONSTITUTION: A steel contg., by weight, 0.10 to 0.25% C, ≤2.0% Si, 1.0 to 3.0% Mn, ≤0.10% P, ≤0.010% S and 0.01 to 0.10% solAl, furthermore contg., at need, 0.015 to 0.10% Nb or Ti and the balance Fe with inevitable impurities is subjected to hot rolling. At this time, the finish temp. in the plate width center part is regulated to ≥800°C as well as ≥40°C higher than that of the plate width edge part. The steel is furthermore coiled at ≥30°C/sec cooling speed at 650 to 400°C in the plate width center part. After pickled, the above hot rolled plate is subjected to continuous annealing in such a manner that it is heated to Ac1 point to 900°C for 1 to 5min and is thereafter cooled to ≥400°C at ≤50°C/sec cooling speed. In this way, the structure of the steel plate is regulated to a low temp. transformation-forming phase of ferrite and martensite having ≥30% volume rate, by which the hot rolled high strength thin steel plate having excellent press formability in the plate width edge part and having ≥70kg f/mm2 tensile strength can be obtd.