An electric junction box comprising: a binding band fitting hole, a bottom wall provided at a lower position in a direction of height, two through holes (26, 27) formed in the bottom wall, and a binding band for securing a wire harness (Wa, Wb, Wc) which is arranged along a lower face of a bottom wall of said binding band fitting hole being provided on said bottom wall through the through holes (26, 27) so as to be positioned at both sides of the wire harness (Wa, Wb, Wc), wherein when said wire harness (Wa, Wb, Wc) is secured, a tip end of said binding band is adapted to be inserted into one of said two through holes (26, 27) from a lower side of said bottom wall, the tip end of said binding band which has been exposed to an upper side of said bottom wall is further adapted to be U-turned in a downward direction, and to be inserted into the other of said two through holes (26, 27), and then, the tip end of said binding band which has been exposed to the lower side of said bottom wall is adapted to be locked to a lock part provided at a base end of said binding band below said wire harness (Wa, Wb, Wc), thereby to secure said wire harness (Wa, Wb, Wc) to the lower face of said bottom wall, wherein an upper face of said bottom wall between said two through holes (26, 27) is formed as a convex curved face (21 a) which is curved in a convex shape in a direction substantially perpendicular to said bottom wall including said two through holes (26, 27), whereby an inner side wall face of an upper inlet (26a, 27a) of at least the other of said two.through holes (26, 27) is formed as an inclined guide face for guiding the tip end of said binding band into at least the other of said two through holes (26, 27). a binding band fitting hole, a bottom wall provided at a lower position in a direction of height, two through holes (26, 27) formed in the bottom wall, and a binding band for securing a wire harness (Wa, Wb, Wc) which is arranged along a lower face of a bottom wall of said binding band fitting hole being provided on said bottom wall through the through holes (26, 27) so as to be positioned at both sides of the wire harness (Wa, Wb, Wc), wherein when said wire harness (Wa, Wb, Wc) is secured, a tip end of said binding band is adapted to be inserted into one of said two through holes (26, 27) from a lower side of said bottom wall, the tip end of said binding band which has been exposed to an upper side of said bottom wall is further adapted to be U-turned in a downward direction, and to be inserted into the other of said two through holes (26, 27), and then, the tip end of said binding band which has been exposed to the lower side of said bottom wall is adapted to be locked to a lock part provided at a base end of said binding band below said wire harness (Wa, Wb, Wc), thereby to secure said wire harness (Wa, Wb, Wc) to the lower face of said bottom wall, wherein an upper face of said bottom wall between said two through holes (26, 27) is formed as a convex curved face (21 a) which is curved in a convex shape in a direction substantially perpendicular to said bottom wall including said two through holes (26, 27), whereby an inner side wall face of an upper inlet (26a, 27a) of at least the other of said two.through holes (26, 27) is formed as an inclined guide face for guiding the tip end of said binding band into at least the other of said two through holes (26, 27).