There is provided an electric junction box 1 for ensuring a watertight performance even when a harness with various thickness is applied, including a box body 2, a tubelar guide portion 6 projecting from the box body 2 and guiding a harness 7 out of the box body 2, wherein the guide portion 6 is provided with a plurality of wall portions 60, 63, divided along the axial direction of the guide portion 6, and at least one of the wall portions 60, 63 is provided with a movable spurtle 65 as a spurtle and a bending portion 64 formed between the movable spurtle 65 and the box body 2 elastically deformable in the outside direction of the guide portion 6, and wherein the inner diameter of the guide portion 6 in neutral state that the bending portion 64 is not in elastic deformation is formed to fit the harness 7 with a minimum outer diameter, and the increase of the outer diameter of the harness 7 leads the bending portion 64 to bend such that the movable spurtle 65 is pushed outward.