A body structure of a forklift truck is provided, with which no dead space is formed in a cross member while securing the constructional strength of the cross member, an increase in length of the truck body due to the space needed in the prior art to locate the exhaust muffler can be evaded resulting in a compact forklift truck, and winding-up of dust on the ground caused when the radiator cooling air flows to the underside of the truck body is prevented without an increase in manufacturing cost. The structure of the vehicle body having a cross member fixed to the inside faces of a pair of left and right side frames is characterized in that the cross member is composed of a vertical plate and a horizontal plate fixed to the vertical plate at a substantially right angle to form a crooked member having the general shape of an inversed letter "L" with an axle support member fixed the lower end of the vertical plate.