Four SP4T switches (31-34) are grouped in twos to form two switch pairs. First conductive lines (411-414, 421-424) are arranged in fours between the SP4T switches (31, 34; 32, 33) constituting the switch pairs. Each of four second conductive lines (51-54) connects to a corresponding one of different conductive lines of the first conductive lines which connect to the respective switch pairs. The first and second conductive lines are arranged on a dielectric layer having a lower surface on which a ground conductor (6) is formed. The dielectric, layer has a two-layer structure. The first conductive lines are arranged on the first dielectric layer as a lower layer. The second conductive lines are arranged on the second dielectric layer as an upper layer. This arrangement makes it possible to attain a reduction in the size of a matrix switch and a reduction in loss and allow broadband operation.