An acoustic-electric transducer for transducing a sound into an electrical signal, comprising: a connection part that has a first connection point configured to contact a first contact (A) in a terminal for processing the electrical signal, and a second connection point configured to contact a second contact (B) having a potential lower than the potential of the first contact (A); an acoustic-electric transducing part configured to transduce a sound inputted from an external source into an electrical signal; a changeover switch that is provided on a first transmission line that is included in a cable connecting the connection part and the acoustic-electric transducing part and is connected to the first connection point , and the changeover switch being configured to switch between a non-mute state where the electrical signal is outputted to the terminal and a mute state where the electrical signal is not outputted to the terminal ; and a current control circuit configured to make a current flow between the first connection point and the second connection point until a predetermined time passes from the time when the connection part is connected to the terminal and configured to reduce the current flowing between the first connection point and the second connection point after the predetermined time passes, wherein the predetermined time is longer than the minimum time required for the terminal to determine whether the acoustic-electric transducer is connected, and the predetermined time is determined by the time constant of the current control circuit , the current control circuit being provided between the first transmission line and a second transmission line that is included in the cable and connected to the second connection point . a connection part that has a first connection point configured to contact a first contact (A) in a terminal for processing the electrical signal, and a second connection point configured to contact a second contact (B) having a potential lower than the potential of the first contact (A); an acoustic-electric transducing part configured to transduce a sound inputted from an external source into an electrical signal; a changeover switch that is provided on a first transmission line that is included in a cable connecting the connection part and the acoustic-electric transducing part and is connected to the first connection point , and the changeover switch being configured to switch between a non-mute state where the electrical signal is outputted to the terminal and a mute state where the electrical signal is not outputted to the terminal ; and a current control circuit configured to make a current flow between the first connection point and the second connection point until a predetermined time passes from the time when the connection part is connected to the terminal and configured to reduce the current flowing between the first connection point and the second connection point after the predetermined time passes, wherein the predetermined time is longer than the minimum time required for the terminal to determine whether the acoustic-electric transducer is connected, and the predetermined time is determined by the time constant of the current control circuit , the current control circuit being provided between the first transmission line and a second transmission line that is included in the cable and connected to the second connection point . <EOS>