Abstract: An electrical connecting structure of a tape carrier package for a LCD driver is provided. The present electrical connecting structure comprises a circuit board having a plurality of conductive terminals, a conductive member having a plurality of rows of conductive portions formed thereon and a tape carrier package of a LCD driver having a plurality of input/output leads. The conductive member is disposed between the circuit board and the tape carrier package. The pitch of the conductive portions is smaller than that of the conductive terminals and that of the input/output leads such that the conductive portions can electrically connect the conductive terminals to the input/output leads. The present electrical connecting structure also can be provided in a mounting structure of a LCD driver tape carrier package with a circuit board for advantageously performing failure analysis.