To provide an electric connection box with a new structure which can compose a wire holding part for holding a wire, with a smaller number of components and more space efficiency.

In an electric connection box, a wire holding part 24 for holding a wire 28a is configured to include a cantilever-shaped holding piece 34 integrally formed in a box body 23, and a contact projection 54 in contact with the wire 28a projects from at least any one of a surface 36 of the box body 23 and the holding piece 34 to be installed in the extension direction of the holding piece 34 in the intermediate part from a tip 44 to a base end part 38 of the holding piece 34.