PURPOSE: To increase the rigidity of a car body in which construction parts made of synthetic resin are used, by fixing a hood onto the car body so as not to be opened and closed.

CONSTITUTION: All the car body parts are made of synthetic resin. A hood 18 and a side member 12 are equipped with a suspended part 18a and an erection part 12a respectively at the position retreated to the inside from the outer surface, and said both parts are tightened fixedly by rivets 58 after, applied with adhesive. Accordingly, the hood 18 is fixed onto the car body, and the rigidity of the car body increases. The first and the second freight rooms 38 and 40 extend from a driver's room side between a lower body 10 and the hood 18. Therefore, when a freight is loaded or unloaded from the first and the second freight rooms 38 and 40, a globe box 32 is opened, and a partitioning plate 44 is turned, and then a driver extends his hand from the driver's room side.