(57) An electric connector, which is connectable to a counter-connector, comprises a main
body (1) having a connection portion at which the counter-connector is to be connected;
and terminals (2, 2) disposed in the main body (1). The connection portion has a structure
for enabling the connection portion to be connected to any one of a plurality of counter-connectors
(200, 300, 400), which have different configurations (200a, 300a, 400a) from each
other, and for coming into contact with the any one of the plurality of counter-connectors
(200, 300, 400) in case where the any one of the plurality of counter-connectors (200,
300, 400) is placed in a position other than a normal position, to prevent the connection
portion from being connected to the any one of the plurality of counter-connectors
(200, 300, 400).
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