A flip-flop (FF201, FF202, FF301, FF203,...) comprising: a first transistor (p6, p10, p14, p28, p22,...) which is a P channel transistor; a second transistor (n5, n10, n13, n18, n21,...) which is an N channel transistor; a third transistor (p8, p12, p16, p20, p23,...) which is a P channel transistor; a fourth transistor (n7, n12, n15, n20, n22,...) which is an N channel transistor; a plurality of input terminals (R, RB, S, SB, INIT, INITB) for receiving respective input signals of the flip-flop (FF201, FF202, FF301, FF203,...), each of the input signals having a temporal change; a first output terminal; a second output terminal; and an input transistor (p5, n9, p13, n17, p21,...), the first transistor (p6, p10, p14, p18, p22,...) and the second transistor (n5, n10, n13, n18, n21,...) constituting a first CMOS circuit such that their gate terminals are connected to each other and their drain terminals are connected to each other, the third transistor (p8, p12, p16, p20, p23,...) and the fourth transistor (n7, n12, n15, n20, n22,...) constituting a second CMOS circuit such that their gate terminals are connected to each other and their drain terminals are connected to each other, the first output terminal being connected to a gate side of the first CMOS circuit and a drain side of the second CMOS circuit, the second output terminal being connected to a gate side of the second CMOS circuit and a drain side of the first CMOS circuit, the input transistor (p5, n9, p13, n17, p21,...) has a gate terminal connected to one of the plurality of input terminals (S, SB, R, RB) and its source terminal is connected to another one of the plurality of input terminals (R, RB, S, SB). characterized in that a drain terminal of the input transistor (p5, n9, p13, n17, p21,...) is connected to the first output terminal (Q, QB). a first transistor (p6, p10, p14, p28, p22,...) which is a P channel transistor; a second transistor (n5, n10, n13, n18, n21,...) which is an N channel transistor; a third transistor (p8, p12, p16, p20, p23,...) which is a P channel transistor; a fourth transistor (n7, n12, n15, n20, n22,...) which is an N channel transistor; a plurality of input terminals (R, RB, S, SB, INIT, INITB) for receiving respective input signals of the flip-flop (FF201, FF202, FF301, FF203,...), each of the input signals having a temporal change; a first output terminal; a second output terminal; and an input transistor (p5, n9, p13, n17, p21,...), the first transistor (p6, p10, p14, p18, p22,...) and the second transistor (n5, n10, n13, n18, n21,...) constituting a first CMOS circuit such that their gate terminals are connected to each other and their drain terminals are connected to each other, the third transistor (p8, p12, p16, p20, p23,...) and the fourth transistor (n7, n12, n15, n20, n22,...) constituting a second CMOS circuit such that their gate terminals are connected to each other and their drain terminals are connected to each other, the first output terminal being connected to a gate side of the first CMOS circuit and a drain side of the second CMOS circuit, the second output terminal being connected to a gate side of the second CMOS circuit and a drain side of the first CMOS circuit, the input transistor (p5, n9, p13, n17, p21,...) has a gate terminal connected to one of the plurality of input terminals (S, SB, R, RB) and its source terminal is connected to another one of the plurality of input terminals (R, RB, S, SB). characterized in that a drain terminal of the input transistor (p5, n9, p13, n17, p21,...) is connected to the first output terminal (Q, QB).