A replaceable key module for a keyboard, comprising: a keycap holder, a springy member and a keycap. The keycap holder embraces an accommodation space, a first surface having an opening, and a second surface having a hole. The springy member is located on the second surface and within the accommodation space of the keycap holder. The keycap is movably connected to the springy member through the opening of the first surface of the keycap holder and capable of moving between a released position and a depressed position. The keycap is referred to as in a released position when not depressed and in a depressed position pushing the springy member to be deformed downwardly when depressed. By means of adjusting some factors such as hardness, length, material and pressing angle of the springy member, the user may obtain the key module with the specified pressure load as desired.