1. A keyboard, comprising:a base plate, comprising:
a first part, including at least one first limiting portion and at least one second limiting portion;
a second part, which is parallel to the first part and has at least a third limiting portion protruding from the second part; and
an inclined part, which is connected to the first part and the second part; and
a thin film circuit board, which is disposed on the base plate, the thin film circuit board comprising:
a first region, which is located at the first part, the first region having at least one opening, the first limiting portion and the second limiting portion being accommodated in the at least one opening, the first limiting portion limiting the first region shifting along a first direction, the second limiting portion limiting the first region shifting along a second direction, the first direction being opposite to the second direction;
a second region, which is located at the second part and has at least one opening; and
at least one connecting portion, which is located at the inclined part, the third limiting portion being passed through the opening of the second region and propped against the connecting portion.