Multi-point ground contact type foot part support mechanism, bipedal walking robot having the support mechanism, and control structure for the robot

The present invention provides a multiple-point grounding type foot portion supporting mechanism having excellent reliability, in which the respective supporting points passively follow unevenness of the grounding surface such as a road surface, and which is capable of quickly supporting foot bottoms at polygonal points and preventing falling over even on a grounding surface having level differences by fixing the supporting points when all supporting points are grounded. The multiple-point grounding type foot portion supporting mechanism includes: base portions each disposed on the foot bottom of the foot portion of a walking robot; three or more foot bottom supporting portions each having its one end part disposed and protruding downward from the bottom face of the base portion, each of which independently moves upward when being grounded and is slidably or rotatably supported; grounding sensors each disposed at the base portion or the foot bottom supporting portion, which detect grounding of the respective foot bottom supporting portions; and lock mechanisms disposed at the base portion, which control and brake the movements of all foot bottom supporting portions when the grounding sensors detect grounding of all foot bottom supporting portions.