Owing to recent development of techniques of finite element analysis and computer hardware, the finite element method has been used more widely for the industrial products. The biggest difficulty here is modeling of complex configuration of industrial products which is most time consuming to engineers and hence takes up large amount of the cost. To overcome this, integrated finite element modeler MODIFY (MODeling tool for Integrated Finite element analYsis) that produces finite element model automatically is developed here. This modeler is based on two new concepts, part object and object oriented data struture. By assembling part objects that have simpler configuration, geometric model of complex configuration can be built up and mesh is generated part by part. The concept of part object enables the geometric configuration to be divided into parts, which are simpler object and easy to generate mesh. The concept of object orineted data structure results in easy handling of local modification of finite element data that is required in both local modification of geometric model and modification of finite element mesh such as in zooming or adaptive meshing. With these concepts, the user do not need to handle finite element model, but only geometric model. The present proto type system is applicable to finite element modeling of two dimensional field, and three dimensional plate strucure which appear in ship structure. Several examples are presented for demonstration.