An improved rotomolded plastic harvester header side shield is disclosed. The shield is pivotable to an open position upwardly and rearwardly about a horizontal hinge located on the upper rear portion of the header. The shield is generally molded on the inside to the operational components of the header to minimize the thickness and weight of the shield and double-walled, with a totally enclosed wall cavity, to maximize its strength and durability. The shield is also open at the bottom to permit any cut crop material and chaff that may enter the shielded area to continually fall through to the ground.