Disclosed are an automobile and a method of controlling an automobile, capable of deploying an airbag at an optimum time. To this end, an automobile according to a first exemplary embodiment of the present invention includes a first sensor configured to detect a relative distance and a relative velocity with respect to a front obstacle of the automobile; a second sensor configured to detect an impact signal value when the automobile collides with the obstacle; and a controller configured to change a set impact critical value by using the relative distance and the relative velocity detected by the first sensor and deploy an airbag when the impact signal value detected by the second sensor is greater than the changed impact critical value.