Keyboard

A keyboard includes a casing, a retaining frame, and a keyboard module. The casing is made from a metallic sheet and has upper and lower parts. The lower part is bent from front and rear ends of the upper part so as to define a gap between the upper and lower parts and two opposite side openings. The casing is formed with a central hole extending through the upper part and in spatial communication with the gap and the side openings. The retaining frame is received detachably in the gap of the casing, has a loop-shaped frame body disposed around the central hole of the casing, and is insertable through one of the side openings of the casing into the gap of the casing. The keyboard module is received in the central hole of the casing and engages the frame body of the retaining frame in a tongue-and-groove engaging manner.