Shape optimization of 3-D structures is a challenging task. The newly developed isogeometrical analysis is a more suitable approach, in comparison with other numerical methods, to address the problem. Apart from the ability of defining the boundaries of the problem by more precision which cannot be easily achieved by other techniques, such as finite element and mesh-free methods, this method takes burden of several remeshings that are needed in the conventional approaches to structural shape optimization. In this research work, the domain of interest is defined by using the Non-Uniform Rational B-Splines (NURBS). Also, a numerical analysis technique is developed which uses the NURBS basis functions in place of the conventional shape functions for approximation. The control points defining the design boundary surface are considered as the design variables of the optimization problem. A few examples are presented to demonstrate the performance of the method.

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