A bus bar edge structure of an electric junction box having a junction block main body, a bus bar-receiving gap arranged on the junction block main body, and a space communicating with the bus bar-receiving gap and arranged in a thickness direction of the bus bar includes a projection piece projecting from an edge of the bus bar at an opening side of the space in the thickness direction of the bus bar. An electric wire led from the junction block main body is guided to the projection piece so as to prevent interference with the edge of the bus bar. The projection piece functions as a press-operating portion configured to insert the bus bar into the bus bar-receiving gap. The projection piece is positioned in an opening of a longitudinal groove arranged in the space so as to prevent the electric wire from entering into the opening.