Fitting construction of electrical connection box

摘要

A fitting construction of an electrical connection box, comprising: a casing member which is made of resin and is formed, at an upper end of its peripheral wall, with a projection; and a cover member which is made of resin and is formed, on a lower face of its peripheral wall, with a downwardly opening fitting groove so as to be mounted on an upper portion of the casing member through fitting of the projection into the fitting groove; wherein the fitting groove is shaped so as to become wider towards a lower end of the fitting groove, while the projection is shaped so as to become wider towards a lower end of the projection; wherein the projection is brought into pressing contact with opposed side faces of the fitting groove at the time of fitting of the projection into the fitting groove so as to spread out the fitting groove.