Mobile object

A mobile object comprising:

• a mobile object base including a front base having front wheels disposed at a distance in a width direction and a rear base being located rearward with respect to the front base and including rear wheels;
• a seat including a seating part having a seating surface and a leg part configured so as to rotatably support the seating part, and being located above the moving base;
• and
• a movable mechanism configured so as to be capable of moving the front base and the rear base relative to each other in order to make a wheel base provided between the front wheels and the rear wheels expandable and contractible, wherein
• the front base is configured so as to be changeable so as to be capable of expanding and contracting a tread width between the front wheels in association with expansion and contraction of the wheel base caused by the movable mechanism,
• the seating part is configured so as to turn forward until the seating surface faces forward via the leg parts in association with the relative movement of the front base and the rear base in order to contract the wheel base and the tread width, and
• the seating part is configured so as to turn rearward until the seating surface faces upward via the leg part in association with the relative movement of the front base and the rear base in order to expand the wheel base and the tread width.