A transmission shifting apparatus of a vehicle, may include a shifter movably installed along at least two straight paths which meet each other at one point, respectively, wherein at least two fixed points are arranged adjacent each other in at least one of straight paths, in which the shifter maintains a position thereof unless an external force is applied thereto, wherein the straight path having the at least two fixed points has a structure extending outwardly to both sides of the at least two fixed points, and wherein one of the at least two fixed points in the straight path is formed to meet the other straight path of the at least two straight paths.