In the coexistence circumstance with humans and robots, sensory and emotional feelings of human should be considered in case of interaction. A typical unpleasant feeling that stems from this interaction is pain. We have developed a new multi-layered pain sensor similar to the laminated structure of human skin, to clarify this feeling which is abstract for robots. The dynamical characteristics of this sensor in either cases of slow and fast stimuli were evaluated in experiments. For both cases, the pain sensor showed a similar reaction with real human measurements. © 2009 SICE.