<p>An analog switch (100) is constructed from metal oxide semiconductor (MOS) transistors and is comprised of a switch (102) for connecting an input terminal VIN (104) and the substrate potential of an NMOS transistor (101); a switch (103) which is operated in the inverse phase of the switch (102) and connects the substrate potential of the NMOS transistor (101) and ground VSS; and a voltage follower circuit (106) which has a high input impedance, is connected between the input terminal (104) and the switch (102), and suppresses the flow of input current from the input terminal (104). When the analog switch constructed from MOS transistors is repeatedly turned on and off, the flow of input current to the substrate can be suppressed.</p>
