A connector structure for electrically connecting circuit boards comprising: a male connector (C1, F1) having a first insulating film having flexibility, male terminal portions constituted by projecting bumps projectingly provided on one surface of the first insulating film, a first metal guide member fixedly disposed so as to cover the other surface of the first insulating film, the first metal guide member being coated with an insulating coating, and first mounting pad terminals for solder mounting on a first predetermined circuit board, which are formed on both side portions of the other surface of the first insulating film, whose surfaces project more than a surface of the first metal guide member, and whose base portions are electrically connected to the male terminal portions respectively; and a female connector (C2, F2) having a second insulating film having flexibility, pad portions formed on one surface of the second insulating film, a second metal guide member fixedly disposed so as to cover the other surface of the second insulating film and the second metal guide member being coated with an insulating coating, female terminal portions constituted by slit openings which are formed so as to penetrate in a thickness direction through the pad portions and portions, of the second insulating film, where the pad portions are located, through-holes each having a sectional area covering the female terminal portion and formed so as to penetrate through the second metal guide member in the thickness direction, and second mounting pad terminals for solder mounting on a predetermined circuit board which are formed on both side portions of the other surface of the second insulating film, whose surfaces project more than a surface of the second metal guide member, and whose base portions are electrically connected to the female terminal portions respectively, wherein the male terminal portions of the male connector (C1, F1) are inserted to the female terminal portions of the female connector (C2, F2) when in use. a male connector (C1, F1) having a first insulating film having flexibility, male terminal portions constituted by projecting bumps projectingly provided on one surface of the first insulating film, a first metal guide member fixedly disposed so as to cover the other surface of the first insulating film, the first metal guide member being coated with an insulating coating, and first mounting pad terminals for solder mounting on a first predetermined circuit board, which are formed on both side portions of the other surface of the first insulating film, whose surfaces project more than a surface of the first metal guide member, and whose base portions are electrically connected to the male terminal portions respectively; and a female connector (C2, F2) having a second insulating film having flexibility, pad portions formed on one surface of the second insulating film, a second metal guide member fixedly disposed so as to cover the other surface of the second insulating film and the second metal guide member being coated with an insulating coating, female terminal portions constituted by slit openings which are formed so as to penetrate in a thickness direction through the pad portions and portions, of the second insulating film, where the pad portions are located, through-holes each having a sectional area covering the female terminal portion and formed so as to penetrate through the second metal guide member in the thickness direction, and second mounting pad terminals for solder mounting on a predetermined circuit board which are formed on both side portions of the other surface of the second insulating film, whose surfaces project more than a surface of the second metal guide member, and whose base portions are electrically connected to the female terminal portions respectively, wherein the male terminal portions of the male connector (C1, F1) are inserted to the female terminal portions of the female connector (C2, F2) when in use.