A switch seat body assembling structure for mounting a switch component, a light source component or a wire connection terminal on a panel or substrate through an opening of said panel or substrate comprising: a main body composed of a metal head section in the form of a thin sheet structure and a nonmetal belly section, wherein the metal head section is made by means of directly pressing a metal thin sheet, the main body being defined with an eccentric axis (y) deviating from a central position of the main body, the nonmetal belly section extending downward from the metal head section in a direction in parallel to the axis, the metal head section having a first wall having a geometrical configuration, a second wall connected with one end of the the first wall and at least one shaft hole positioned on the eccentric axis (y), wherein the shaft hole is directly pressed into a geometrical configuration, wherein the first and second walls together define the shaft hole, the first wall being normal to the eccentric axis y or inclined from the eccentric axis y, the second wall being parallel to the eccentric axis y or inclined from the eccentric axis y, whereby the first and second walls (11, 12) contain an angle, which is an acute angle, a right angle or an obtuse angle, each of the first and second walls (11, 12) having an outer surface (11a, 12a) and an inner surface (11b, 12b), the first and second walls (11, 12) together defining therebetween a first space for the nonmetal belly section to fill the first space, the nonmetal belly section being formed with a second internal space, the nonmetal belly section being formed with a tray section filling the first space to at least connect with entire sections of the inner surface of the first wall and the outer surface of the second wall, whereby the metal head section covers at least partially the tray section of the nonmetal belly section and the metal head section and the nonmetal belly section are connected as an integrated body structure. a main body composed of a metal head section in the form of a thin sheet structure and a nonmetal belly section, wherein the metal head section is made by means of directly pressing a metal thin sheet, the main body being defined with an eccentric axis (y) deviating from a central position of the main body, the nonmetal belly section extending downward from the metal head section in a direction in parallel to the axis, the metal head section having a first wall having a geometrical configuration, a second wall connected with one end of the the first wall and at least one shaft hole positioned on the eccentric axis (y), wherein the shaft hole is directly pressed into a geometrical configuration, wherein the first and second walls together define the shaft hole, the first wall being normal to the eccentric axis y or inclined from the eccentric axis y, the second wall being parallel to the eccentric axis y or inclined from the eccentric axis y, whereby the first and second walls (11, 12) contain an angle, which is an acute angle, a right angle or an obtuse angle, each of the first and second walls (11, 12) having an outer surface (11a, 12a) and an inner surface (11b, 12b), the first and second walls (11, 12) together defining therebetween a first space for the nonmetal belly section to fill the first space, the nonmetal belly section being formed with a second internal space, the nonmetal belly section being formed with a tray section filling the first space to at least connect with entire sections of the inner surface of the first wall and the outer surface of the second wall, whereby the metal head section covers at least partially the tray section of the nonmetal belly section and the metal head section and the nonmetal belly section are connected as an integrated body structure.