To provide an in-tunnel road structure which hides a passer-by from a driver's diagonal front view to prevent the driver from looking off the traffic while lighting up the inside of the tunnel as much as possible to illuminate a pathway brightly.

The in-tunnel road structure includes a roadway 20, the pathway 21, an illumination 23, and a screen fence 1 inside the tunnel 2. The screen fence 1 is composed of a plurality of posts 5 arranged along the edge of the pathway 21, a beam member 6 attached across each post 5, and a fence panel 3 attached to the beam member 6. The fence panel 3 is arranged in a continuous corrugated form in the longitudinal direction along the boundary between the fence panels 3 and the roadway 20 in a plan view. The faces of the fence panel 3 viewed by the driver in the diagonal front in the direction of traveling of a vehicle 22 is formed with nonporous faces 30, and the faces of the same viewed by the driver in the rear after the vehicle 22 passing is formed with porous faces 31 having a number of pores.