The present invention discloses a keyboard device comprising M drive circuits, N transconductance circuit control modules, M column signal lines, N line signal lines and M * N key units. The control module scans the M column signal lines in M scan cycles. In the N key units, when the key unit at the intersection of the column signal line located at the k-th column and the x-th line signal line is pressed, the switch included in the key unit transmits the scan voltage on the column signal line to the line signal line The The transposed circuit connected to the line signal line changes the generated output voltage depending on whether or not it is turned on. The control module determines whether the key unit is pressed according to the potential of the output voltage. According to the present invention, it is possible to accurately determine the pressing state of the key unit located in the same column in each scanning cycle, and to effectively avoid the generation of the ghost key phenomenon, thereby improving the accuracy of judging the pressing state of the key unit.