A vehicle body structure is configured that enables a cabin section and a chassis frame to move relative to each other and enables both strength of the vehicle body and the safety of the occupants during a collision to be ensured with good efficiency. The cabin section serves as the space in which the passengers reside. The chassis frame and cabin section are separate, independent structures connected through a displacement mechanism in such a manner that the chassis frame and cabin section can move separately relative to each other, when a collision occurs. As a result, transmission of the collision impact to the cabin section is alleviated in an effective manner and the strength of the cabin section and chassis frame can be increased.