A button, a game controller and a remote controller are provided. The button comprises a cylindrical button cap (1) and a cylindrical button bracket (2). The button bracket (2) is provided with a first magnetic connector (3), and the button cap (1) is provided with a second magnetic connector (4) at a corresponding position. The button cap (1) is covered on the button bracket (2), and the button cap (1) and the button bracket (2) are connected by a magnetic attraction force between the first magnetic connector (3) and the second magnetic connector (4). The button cap (1) and the button bracket (2) may be further provided with engageable sawtooth structures (11, 21).