Abstract: A remote controller casing includes a front shell; a rear shell, which has an assembly means with the front shell, wherein the assembly means is coupled and fixed for the rear shell and the frond shell to develop an accommodating space to hold a printed circuit board, and the rear shell further comprises a battery bay whose one interior edge is designed to have a convex part, at least one concave part at one side, and a groove corresponding to the concave part and located at an opposite side; and a back cover, which includes at least one clasper at one ide which is opposite to the concave part, and at least one clamping part at an opposite side.