A comparison circuit includes: an input circuit includes a first transistor for receiving a first signal, and a second transistor for receiving a second signal; a first current route of which the electric current is controlled by the first transistor; a second current route of which the electric current is controlled by the second transistor; a latch for amplifying potential difference between the first current route and the second current route; a comparative operation control circuit including a first switch for executing or blocking supply voltage to the drain of the first transistor, a second switch for executing or blocking supply voltage to the drain of the second transistor, and a third switch for executing supply voltage to the first current route and the second current route; a comparative operation setting circuit for controlling supply or blocking of supply of the first switch, the second switch, and the third switch.