Wide base type pneumatic tire for construction vehicle

A wide base type pneumatic tire for construction vehicle comprising a crown portion and a shoulder, said tire having such a sectional thickness distribution that a thickness at a middle point between crown center and shoulder is 0.95-1.08 times and a thickness at said shoulder is 1.00-1.30 times on the basis of the thickness of said crown center measured at meridional section of tire, said crown portion having at its surface a tread pattern forming a lug arrangement as a whole, the width of said lug measured along the circumferential direction of tire being 2.0-2.2 times at the crown center area and 1.25-1.35 times at the shoulder area with respect to a width of a groove between said lugs measured along the circumferential direction of tire, and the radius of said crown portion being not less than 75% of the overall tire width under normal inflation pressure.