A testing system includes a plurality of test applying portions and a plurality of testing portions, each test applying portion having a test device that generates an output signal and each testing portion tests the output signal of the test device, in response to the test applying portion. The testing system further includes a switch portion that switches the output signal of the test device between the test applying portions and the testing portions. The switch portion includes, a first switch having an input port and a plurality of output ports, which selects the output port for connecting the input port, a second switch having a plurality of input ports and an output port, which selects the input port for connecting the output port, and a connecting portion that has a plurality of transmission parts that connect the output ports of the first switch and the input ports of the second switch.