A rocker bogie includes a first base which including a first wheel, a second wheel, and a third wheel each of which is configured to be in contact with a first flat surface, a second base including a fourth wheel which is configured to be in contact with the first flat surface, and a rotary shaft connecting the first base and the second base to each other such that the second base is rotatable with respect to the first base. The rotary shaft is parallel to a first straight line which connects a rotation center of the first wheel and a rotation center of the second wheel to each other and is disposed between a rotation center of the third wheel and the first straight line, and the fourth wheel is disposed at an opposite position to the third wheel across the first straight line.