A mobile unit, which is provided with a plurality of frames formed to extend from a base body (10) and provided with a plurality of thrusters arranged in the same plane, the plurality of thrusters generating a thrust component in a direction perpendicular to the plane and thereby providing lift while the mobile unit is traveling. The orientation of the mobile unit is measured by an inertial measurement unit, and each of the thrusters is controlled by a control unit on the basis of the orientation of the mobile unit measured by the inertial measurement unit. An annular guard portion for rolling is formed so as to surround the base body and the plurality of thrusters. The frames extend between the base body and the guard portion, and each of the thrusters has a rotor (30a) which has a plurality of blades having a variable angle of attack. The thrust vector generated by each of the thrusters is inclined with respect to the direction perpendicular to the plane where the thrusters are arranged.
