To provide a concrete construction reinforcing structure which enhances the construction efficiency of reinforcing work for an existing frame comprising columns and beams, drastically reduces noise, vibration, and dust during execution of the reinforcing work, and allows use of the construction during execution of the reinforcing work.

In the reinforcing structure which is implemented by mounting an added portion formed of a steel frame body in the frame enclosed by the columns 11 and beams 12 of the existing construction, synthetic resin sheets 20 with bumps are stuck to surfaces of the columns and beams, facing to the added portion. Specifically each synthetic resin sheet 20 has a plurality of projections 22 integrally formed therewith, and each projection 22 has a head 22a at the tip thereof, that is enlarged in cross section relative to an intermediate portion 22c. Further the steel frame 14 has stud bolts 15 or shear keys 31 protruded from an outer periphery thereof, and mortar 17, 33 is filled in a gap between the sheet with bumps and the steel frame body. The expansion part may be formed of reinforced concrete 41.