Most simple bone cysts are found in the metaphysis of the long bone, such as proximal humerus or proximal femur. Appropriate treatment is aspiration of the cyst followed by instillation of methylprednisolone or curettage with bone graft. We experienced 1 case of the simple bone cyst of the metatarsal bone. This case was treated by curettage and inserting allograft into the defect.