Patent ID: 7871214

Claim:
A keyboard unit comprising: a keyboard body that includes: a base that is shaped in a plate-like shape, a support unit that is disposed on the base and that is moveable upward and downward, and a plurality of keys including a plurality of character keys being disposed in a central portion and a plurality of function keys being disposed in a peripheral portion outward the central portion, each of the plurality of keys including a key top, the key top being disposed on the support unit; and a detecting unit that detects exposure to a liquid and that is disposed on the base so as to face an under side of the key top, the detecting unit being a plurality of water immersion detection sheets that are formed to change appearance upon contact with the liquid, wherein a number of water immersion detection sheets provided under the plurality of function keys is greater than a number of water immersion detection sheets provided under the plurality of character keys, wherein the base is inclined so that a rear portion of the base is higher than a front portion of the base and a peripheral portion of the base is curved so that a central portion of the base is slightly lower than the peripheral portion, and wherein the detecting unit is located on a rear portion in a space on the base covered by the key top.