A semiconductor device may include a plurality of chips and a test pad. The plurality of chips may check parity bits of a plurality of pattern signals activated in units of specific bits and store test result signals generated by the checking of the parity bits. The plurality of chips may output an error detection signal when an error is detected from any of the test result signals. The test pad may output the error detection signal received from the plurality of chips to an external part. The plurality of chips may be commonly coupled to at least one connection line such that, when the error detection signal is output from at least one of the plurality of chips, the outputted error detection signal s output through the test pad.