To provide a gravitational vehicle allowing a user to enjoy not only riding a completed vehicle but also assembling the vehicle by the user himself/herself to feel the pleasure of making an object.

The gravitational vehicle 1 with the gravity on a slope as the propulsive force is made up by assembling a kit. The kit, which can be assembled/disassembled, comprises a group of body component members to be a body 10 including a seat part 12 without including a propulsion source, a group of component members for a front wheel mechanism 20 to constitute a front wheel 21 and a mechanism 20X for steering the front wheel, a group of component members for a rear wheel mechanism 30 to constitute a rear wheel 31 and a mechanism 30X to control the rear wheel, and a connection means for connecting the component members in such a way that the most of the members are detachable to make up the vehicle 1.