A connector adapted to connect a wire to a circuit board, comprising: an insulating housing comprising: a first part mounted on a first surface of the circuit board, and insertion holes; and at least one conductive terminal (2, 2') each comprising: a main body (21, 21') received in the insulating housing and communicating with the insertion holes; a pair of elastic clamping sheets (22, 22') formed on the main body (21, 21') and adapted to clamp a wire inserted into the main body (21, 21') through the insertion hole; welding legs (23, 23') welded to electric contacts located on the first surface of the circuit board and electrically connected to the elastic clamping sheets (22, 22'); and a releasing mechanism (24, 24') integrally formed on the main body (21, 21') and adapted to press and separate the pair of elastic clamping sheets (22, 22') in directions away from each other, to release the clamped wire, characterized in that the insulating housing further comprises a second part extending beyond a second surface of the circuit board opposite to the first surface from the first part through the circuit board, the insertion holes being formed in the second part, wherein the conductive terminal (2, 2') is further provided with a first annular end portion located at one end of the main body (21, 21') for passing the wire through same, and a second annular end portion located at the other end of the main body (21, 21') for accommodating an end of the wire inserted in the connector, and wherein one of the two welding legs (23, 23') extends outwards in an insertion direction of the wire from a top of the first annular end portion and the other of the two welding legs (23, 23') extends outwards from a top of the second annular end portion. an insulating housing comprising: a first part mounted on a first surface of the circuit board, and insertion holes; and at least one conductive terminal (2, 2') each comprising: a main body (21, 21') received in the insulating housing and communicating with the insertion holes; a pair of elastic clamping sheets (22, 22') formed on the main body (21, 21') and adapted to clamp a wire inserted into the main body (21, 21') through the insertion hole; welding legs (23, 23') welded to electric contacts located on the first surface of the circuit board and electrically connected to the elastic clamping sheets (22, 22'); and a releasing mechanism (24, 24') integrally formed on the main body (21, 21') and adapted to press and separate the pair of elastic clamping sheets (22, 22') in directions away from each other, to release the clamped wire, characterized in that the insulating housing further comprises a second part extending beyond a second surface of the circuit board opposite to the first surface from the first part through the circuit board, the insertion holes being formed in the second part, wherein the conductive terminal (2, 2') is further provided with a first annular end portion located at one end of the main body (21, 21') for passing the wire through same, and a second annular end portion located at the other end of the main body (21, 21') for accommodating an end of the wire inserted in the connector, and wherein one of the two welding legs (23, 23') extends outwards in an insertion direction of the wire from a top of the first annular end portion and the other of the two welding legs (23, 23') extends outwards from a top of the second annular end portion.