Input device

An input device comprising:

• a casing, at least one oblique guide rail being formed on at least one inner wall of the casing;
• a first keyboard slidably connected to the casing and having at least one first transverse guide rail and a guide rail perpendicular or oblique to the first transverse guide rail;
• and
• a second keyboard comprising:
• a first sliding member for sliding along the first transverse guide rail and the guide rail so as to make the second keyboard slidably connected to the first keyboard;
• and
• a second sliding member slidably disposed in the oblique guide rail for making the second keyboard connected to the casing in an obliquely slidable manner;
• wherein when the first keyboard slides toward an expanded position relative to the casing, the first sliding member passes through the first transverse guide rail to abut against the guide rail for driving the second sliding member to slide along the oblique guide rail, so that the first sliding member slides upwardly along the guide rail;
• when the first keyboard slides toward a folded position, the guide rail abuts against the first sliding member for driving the second sliding member to slide along the oblique guide rail, so that the first sliding member slides downwardly along the guide rail.