To easily perform a maintenance such as battery exchange by providing an obstacle touching means to slide and a detecting means for detecting that the obstacle touching means is slid in a prescribed 2nd direction.

A bumper type sensor 103 is held by bumper holding parts 203a and 203b and can be turned upward with the holding parts 203a and 203b. Besides, a handle 110 is installed and the front face part of this handle 110 is made into a curved surface so as to turn the bumper type sensor 103 even in up state. Then, this bumper type sensor 103 is slid back and forth to the main body of the robot. Therefore, when the obstacle touches the bumper type sensor 103 while the movable robot moves, the bumper type sensor 103 is moved back, any one of switches 202 installed inside is pushed down, and the contact with the obstacle is detected.