What is the Best CAD Learning Software for Automobile Designing?

AutoCAD is a good program to learn and is pretty much the CAD industry standard. Created by Autodesk, they are many different types of CAD programs that are discipline specific. If you are in Japan, contact Autodesk to find an authorized training center near you. Tell them you're interested in learning Automotive CAD design and they should be able to head you in the right direction.