Keyboard device and palm rest module thereof

A keyboard device, comprising:

• a keyboard module;
• and
• a palm rest module arranged beside a lateral side of the keyboard module, and configured to support a wrist of a user, wherein the palm rest module comprises a pedestal, a casing and an adjusting element, wherein the casing is disposed on the pedestal, the adjusting element is arranged between the pedestal and the casing, and a position of the casing relative to the pedestal is adjustable through the adjusting element,
• wherein in a first usage state, the casing is moved toward the keyboard module or moved away from the keyboard module through the adjusting element, wherein in a second usage state, the casing is rotated about the adjusting element and relative to the keyboard module, so that an included angle is formed between the casing and the lateral side of the keyboard module,
• wherein the palm rest module further comprises at least one positioning block, and the at least one positioning block is installed on the pedestal, wherein the at least one positioning block comprises plural positioning recesses, the adjusting element further comprises at least one first positioning bulge, and the at least one first positioning bulge is inserted into one of the plural positioning recesses.