The proportion of the population using a wheelchair doesn't quit increasing. Several users sometimes pass a big part of the day in their wheelchair, this one becoming a primary space that has the tendency to confound with the personal space, to the point to become a «elongation" of their body. The goal of our work is to maximize a qualities of the device to answer to the following criteria’s: autonomy in displacements and transfers, comfort, security, respect of the anthropometry, access to the environment, aesthetic, lightness, solidity, durability, cost, adaptability of components,. These will make the object of a new designs development capable to optimize the ergonomics of the wheelchair.