In a structural concept design, to create topology as solution principle from functional requirement is greatly dependent on the accumulated engineering knowledge, experience and know-how. These engineering senses are called as The Mechanical Kansei. Ant Colony Topology Optimization (ACTO) was applied major principal stress in topology optimization. ACTO considered major principal stress and Von Mises stress using by pheromone control and can apply the accumulated engineering knowledge. However, A part of experience and know-how which are had designer can consider, because experience and know-how is different each designer. Therefore, ACTO is not perfect for the Mechanical Kansei. In this study, we confirm that ACTO is possible to consider individual differences in the Mechanical Kansei each of the designers using by pheromone control. In addition, we improve and change the method to consider individual differences in the Mechanical Kansei.