The invention relates to a vehicle (1) including a user seat comprising a backrest (3), a seat portion (4) and lateral edges (5) provided on both sides of the seat portion. The vehicle has a reduced production cost and a structure that facilitates the adaptation thereof to a plurality of activities, in particular owing to the fact that the seat, which is made from plastic, is produced in the form of a single piece, the lateral edges (5) being extended downwards such as to form two rear conduits intended to receive at least one rear movement member (26, 27, 28). The invention also relates to a vehicle production method in which rotational molding is used to form an ergonomic seat.
