To prevent contact of a brake system with a leg part of an occupant at the time of collision, etc., to protect the occupant, to inspect the brake system and to improve workability of maintenance by a simple means on a cab over type small vehicle.

A brake booster 2 having a working direction in a direction roughly orthogonal with the operating direction of a brake pedal 3 is horizontally placed on the back surface side of a front inner panel 13 of a cab, and it is arranged separated from a knee 27 of an occupant. The brake booster 2 is connected to the brake pedal 3 through a link mechanism part 4. Additionally, a maintenance hatch 15 to inspect and maintain the brake booster 2, etc., is provided on the front inner panel 13. Furthermore, the front inner panel 13 is covered with a front lid 14.