A shift control device of a manual transmission is provided. The shift control device includes a shift rod including a rod; a shift lock for limiting movement of the rod; and a controller which can compare the speed of a vehicle with a predetermined critical speed of a predetermined shift and controlling the shift lock. The shift lock includes a drive part including a moving magnet capable of linearly reciprocating in the leftward selection direction of the rod and the rightward selection direction of the rod; and a shift lock rod including a fixing magnet. When the speed of the vehicle is greater than the critical speed, the controller allows the moving magnet to move in the leftward selection direction, the fixing magnet moves in the rightward selection direction through repulsive force between the moving magnet and the fixing magnet, the shift locking rod is positioned on a shift path of the predetermined shift, and the rod is limited to move in the shift direction of the predetermined shift.