A signal distributing/combining apparatus for an antenna device of a mobile communication base station, the signal distributing/combining apparatus comprising: a circuit board configured to have an upper surface formed with a signal distributing/combining conductor pattern for a high frequency signal distributing/combining operation; a support plate configured to have an upper mounting surface of a size corresponding to the circuit board, to mate with the circuit board so that an underside of the circuit board is in close contact with the upper mounting surface for supporting the circuit board, configured for an antenna device of a mobile communication base station comprising a reflection plate of the antenna device on a bottom side of the support plate, the signal distributing/combining conductor pattern is formed with a plurality of signal input/output portions, wherein the support plate is provided with a plurality of cable holders with portions formed corresponding to the plurality of signal input/output portions of the signal distributing/combining conductor pattern for supporting and fixating coaxial cables (22, 71, 73) for signal transmission, which are connected from outside of the signal distributing/combining apparatus, and the plurality of cable holders is formed on the signal distributing/combining conductor pattern at portions corresponding to at least some of the plurality of signal input/output portions, the cable holders having a structure formed elongated longitudinally and corresponding to outer conductors of the coaxial cables (71, 73) in order to mount the coaxial cable by inserting the outer conductors, characterized in that the support plate comprises a mounting surface configured to mount the circuit board and to have one or more partition members formed in a predetermined length and a predetermined height, the circuit board has one or more slots to be coupled with the partition members in such a manner that the partition members are inserted, and the partition members are formed so as to protrude from the upper surface of the circuit board on which the conductor pattern is formed to a preset height. a circuit board configured to have an upper surface formed with a signal distributing/combining conductor pattern for a high frequency signal distributing/combining operation; a support plate configured to have an upper mounting surface of a size corresponding to the circuit board, to mate with the circuit board so that an underside of the circuit board is in close contact with the upper mounting surface for supporting the circuit board, configured for an antenna device of a mobile communication base station comprising a reflection plate of the antenna device on a bottom side of the support plate, the signal distributing/combining conductor pattern is formed with a plurality of signal input/output portions, wherein the support plate is provided with a plurality of cable holders with portions formed corresponding to the plurality of signal input/output portions of the signal distributing/combining conductor pattern for supporting and fixating coaxial cables (22, 71, 73) for signal transmission, which are connected from outside of the signal distributing/combining apparatus, and the plurality of cable holders is formed on the signal distributing/combining conductor pattern at portions corresponding to at least some of the plurality of signal input/output portions, the cable holders having a structure formed elongated longitudinally and corresponding to outer conductors of the coaxial cables (71, 73) in order to mount the coaxial cable by inserting the outer conductors, characterized in that the support plate comprises a mounting surface configured to mount the circuit board and to have one or more partition members formed in a predetermined length and a predetermined height, the circuit board has one or more slots to be coupled with the partition members in such a manner that the partition members are inserted, and the partition members are formed so as to protrude from the upper surface of the circuit board on which the conductor pattern is formed to a preset height.