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The housing accounts for a large portion of the overall weight of automotive transmissions, making it a part with a high need for weight reduction. In addition, while the application of topology optimization for the purpose of reducing weight and increasing rigidity is nearing a practical level, there are no reports yet of methods for effectively applying topology optimization to complex shapes such as transmission housings. Therefore, this study developed a topology optimization method as a tool for use in the design of lightweight and high-rigidity automotive transmission housings. The modeling method uses a double-layered structural mesh so that topology optimization calculations can be performed for transmission housings with a hermetic structure. This method realized a reduction in weight while still meeting the target rigidity values for transmission housings.