A key structure of keyboard including a base, at least one force sensing membrane disposed on the base, a scissors mechanism, a key cap, a bracket sets assembled to the key cap, a first sleeve, a second sleeve, a spring, and a pressing member disposed at a bottom of the second sleeve is provided. A side of the scissors mechanism is movably leaned against the base and located on the force sensing membrane, and another side of the scissors mechanism is pivoted to the bracket sets. A portion of the first sleeve is assembled between the key cap and the bracket sets, and another portion of the first sleeve passes through the bracket sets. The second sleeve is movably socketed in the first sleeve. The spring is leaned against the second sleeve and the key cap. A keyboard is also provided.