Piezoresistive effect can be defined as a change in the electrical resistivity of materials such as metals, semiconductors, and conductive polymers under applied mechanical stress. Because it changes only the electrical resistance, the piezoresistive effect is different from the piezoelectric effect that changes the electric potential. Although metallic and inorganic semiconductor materials have been widely used in piezoresistors, these materials are heavy, not mechanically durable or conformable to end-uses, and require complex manufacturing processes. To overcome these limitations, conductive fillers and polymer composite materials have been used as piezoresistors. Compared to metals and semiconductors, these polymeric materials not only have distinct electrical and mechanical properties but are also lightweight, inexpensive, corrosion resistant, and ease to process. And the rubber materials have some advantages in the electromechanical experiment due to the elasticity. In other word, rubber shows the notable electromechanical property rather than plastics. Among them, polydimethylsiloxane (PDMS, silicone rubber) has outstanding environmental stability with excellent insulating, flexible, thermal, and mechanical properties. Moreover, the composites made with silicone rubber feel like human skin, and thus, provide a good esthetic feeling. In this presentation, research trend using silicone rubber will be introduced and two examples based on silicone rubber will be discussed: one with piezoresistive effects near critical pressure and second with piezoresistive behavior having the stretchable and wrinkled structure. (seshim@inha.ac.kr). Keywords: Piezoresistive behavior; Electrical resistance; Silicone rubber