A modular interchangeable mobility device comprises an electric platform comprising a base platform which comprises wheels, a motor to drive the wheels and a battery to supply power to the motor, and an upper coupling part configured to be detachably coupled with an upper module located on the base platform, and a folding-type chair attached to the base platform and configured to provide a space for the upper module when folded and serve when unfolded as a seat such that the modular interchangeable mobility device may be used as an electric scooter.