Keyboard and backlight module

A backlight module, applied to a keyboard, wherein the keyboard comprises a base plate and a plurality of keys, the base plate has a short-axis direction and a long-axis direction, wherein each of the plurality of keys is disposed on the base plate, and the backlight module is disposed on a side of the base plate, the backlight module comprising:

• a shielding sheet comprising an upper surface and a lower surface, the upper surface facing toward the base plate;
• a light guide plate disposed on the lower surface of the shielding sheet, wherein the light guide plate comprises a plurality of light guide structures corresponding to each of the plurality of keys respectively, each of the light guide structures comprises a ring portion and at least one bend line portion, the bend line portion connects to the ring portion, and the ring portion is formed by a plurality of bending portions;
• and
• a reflecting sheet disposed below the light guide plate.