PURPOSE: A weight structure using waste synthetic resins and sand is provided to improve strength, durability and elasticity, to prevent environmental pollution and to reduce the cost by reutilizing wasted resources. CONSTITUTION: The weight structure using waste synthetic resins and sand comprises synthetic resin chips and sand, in a mixing ratio of 40-90:10-60 (by the volume basis), and further comprises an adhesive. The weight structure is manufactured by the method comprising the steps of: finely dividing waste synthetic resins to form synthetic resin chips; mixing the synthetic resin chips with sand and an adhesive, and blending them uniformly to obtain a mixture; and compressing the mixture with a press mold or a press roll to form an integrated solid product.