A gaming controller includes a main body and a support device. The support device includes a base member, a bracket assembly and a positioning member. The bracket assembly is installed on the base member and includes a first frame and a second frame. The first frame and the second frame are movable relative to the base member. The first frame includes plural positioning holes. The positioning member is installed on the base member and arranged between the positioning member and the second frame. The positioning member includes a positioning unit. While an operation state of the support device is switched from a storage state to a first usage state, the first frame is moved away from the base member. When a front end of the first frame is moved to a first location, the positioning unit is embedded in a first positioning hole.