A connecting device of a door trim and a pull handle for a vehicle includes a sliding back prevention boss which protrudes from the door trim of the vehicle and a supporting boss which protrudes from the pull handle mounted on the door trim and inserted into the sliding back prevention boss. As such, a phenomenon in which sharp edges are generated due to a broadside collision of a vehicle may be prevented and collision energy due to the collision may be decreased, thereby making it possible to improve salability and safety for a passenger.