Noise reduction circuit includes first and second reset signal generation circuits generating first and second reset signals activated when a data input signal goes to a low level or a high level and are deactivated in synchronization with a clock signal when a high or low level is maintained, and first and second counter circuits that count an inverted signal of clock signal and are reset by the first or second reset signal. The noise reduction circuit further includes a data output circuit including a selector circuit and an output flip-flop circuit that outputs a signal selected by the selector circuit in synchronization with the clock. The selector circuit selects and outputs any of: signal fixed at a high level or low level, and output signal of the output flip-flop circuit, according to logic levels of output signals of the first and second counter circuit.