To provide a mobile body with high operability and a method for controlling the same.

The mobile body 1 moves in response to the weight shift of a passenger and includes: a passenger seat 8 where a passenger sits; an undercarriage 13 for supporting the passenger seat 8; rear wheels 602 for moving the undercarriage 13; a force sensor 9 outputting a measurement signal according to the force applied to a boarding face of the passenger seat 8; a seat belt 21 attached to the passenger seat 8 and changing the output of the force sensor 9 in response to tension; and a control part for controlling the rear wheels 602 in response to the output from the force sensor 9.