Work Vehicle

A work vehicle includes: a body ; a plurality of travel wheels at front and back portions of the body on each of left and right sides; a plurality of holder mechanisms A held by the body and holding the respective travel wheels in such a manner as to be capable of moving the travel wheels independently of one another relative to the body ; a detector B configured to detect a state of a travel surface; and a controller C configured to, based on the state that the detector B has detected, control the holder mechanisms A to move the travel wheels relative to the body