To provide a single bearing girder adaptable to excavated ditches different in ditch width.

This bearing girder 3 is used for road lining work of construction work which is performed by forming the excavated ditch in a road surface. The bearing girder 3 comprises: a main long body 31 with long and short sides; an end plate 32 which is mounted on the side of at least one of longitudinal ends of the main body 31; a pushing bolt 37 which is partially protruded from an outside surface of the end plate 32, and which enables the protrusion/receding of a portion protruding along the longitudinal direction of the main body 31; and a pushing plate 34 freely movable along the longitudinal direction of the main body 31.