A shift member fixing structure of electrical connection terminal, comprising: a main body defining a chamber, the main body having a wire inlet in communication with the chamber; a shift member having a pivoted end pivotally connected with the main body and an operation end, the shift member being reciprocally movable between an open position and a closed position, the shift member further having a press section; and a metal leaf spring disposed in the chamber, the metal leaf spring having a first section and a second section, the first section having a head end, the second section having a tail end, the press section serving to press and move the first section of the metal leaf spring so as to press a conductive wire and electrically connect with the conductive wire; wherein a predetermined section of the shift member is formed with an insertion section and the main body is formed with an interference section for being correspondingly assembled by insertion into the insertion section of the shift member when the shift member is in the closed position, the insertion section being formed for this purpose by two walls each having a side defining a side of the insertion section that is facing the other side of the insertion section; characterized in that at least one of said walls has, on its side opposite to the one defining a side of the insertion section, a depression section obtained by removal of part of said wall, so as to provide an elastic effect for the deformation of said wall when the inteference section is inserted into the insertion section, and the walls on both sides of the insertion section of the shift member have tail end sections, while the tail end section of the wall on at least one side is formed with a stop end, the stop end being a protrusion, whereby a width between the tail end sections is smaller than a width of the insertion section between the remaining parts of the walls, the interference section of the main body including interference sides and a head end connected with the interference sides, and for the wall with the stop end, or for each said wall in case both walls have a stop end, the respective interference side being formed with a recess corresponding to the protrusion forming said stop end, whereby a width of the head end of the interference section is larger than a width between the interference sides. a main body defining a chamber, the main body having a wire inlet in communication with the chamber; a shift member having a pivoted end pivotally connected with the main body and an operation end, the shift member being reciprocally movable between an open position and a closed position, the shift member further having a press section; and a metal leaf spring disposed in the chamber, the metal leaf spring having a first section and a second section, the first section having a head end, the second section having a tail end, the press section serving to press and move the first section of the metal leaf spring so as to press a conductive wire and electrically connect with the conductive wire; wherein a predetermined section of the shift member is formed with an insertion section and the main body is formed with an interference section for being correspondingly assembled by insertion into the insertion section of the shift member when the shift member is in the closed position, the insertion section being formed for this purpose by two walls each having a side defining a side of the insertion section that is facing the other side of the insertion section; characterized in that at least one of said walls has, on its side opposite to the one defining a side of the insertion section, a depression section obtained by removal of part of said wall, so as to provide an elastic effect for the deformation of said wall when the inteference section is inserted into the insertion section, and the walls on both sides of the insertion section of the shift member have tail end sections, while the tail end section of the wall on at least one side is formed with a stop end, the stop end being a protrusion, whereby a width between the tail end sections is smaller than a width of the insertion section between the remaining parts of the walls, the interference section of the main body including interference sides and a head end connected with the interference sides, and for the wall with the stop end, or for each said wall in case both walls have a stop end, the respective interference side being formed with a recess corresponding to the protrusion forming said stop end, whereby a width of the head end of the interference section is larger than a width between the interference sides.