The present invention reduces the use number of joint count and actuators, complex control program is also not necessary, small size, can be lighter and less expensive reduction, yet walking condition is stable, and, as a pet robot that can have the there is a charming friendly It will provide a suitable short leg two-legged robot. The invention relates to a robot having a relatively short two legs to the upper body to the lower body side, a center of gravity movable upper body portion body on the left and right and lower body portion body connected to this, the lower body portion body and comprising means for widening the free leg of the side not riding center of gravity in a state where the center of gravity moves, and means for draw the free leg by rotating the support legs on the side riding center of gravity forward in a state where the center of gravity moves . .BACKGROUND
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