A data failure detection circuit of embodiments includes a monitor signal generation circuit configured to generate a monitor signal to be used to sense failures of a plurality of test mode signals to be respectively input to a plurality of modules, a cascade connection circuit configured to sense a failure of each of the test mode signals and including a plurality of OR circuits, and a comparison circuit configured to compare an output signal from the cascade connection circuit with the monitor signal to determine whether or not a failure exists. In the cascade connection circuit, a plurality of OR circuits are connected in cascade, and the monitor signal is input to one of the OR circuits in a first stage.