An object of this invention is to provide a connector housing which can be prevented a terminal-receiving chamber from receiving a wrong metal terminal.A connector housing 1 comprises a plurality of terminal-receiving chambers 20 and a plurality of marks 21. The terminal-receiving chamber 20 receives a male terminal 3. Electric wire 2 is attached to the male terminal 3. A mark 6 is formed on an outer surface 5a of the electric wire 2. A color of the mark 6 of one electric wire 2 is a first color R. A color of the mark 6 of the other electric wire 2 is a second color G. The first color R is different from the second color G. The mark 21 corresponds to each terminal-receiving chamber 20. A color of one mark 21 is the first color R, which is the same as the color of the mark 6 of the one electric wire 2. A color of the other mark 21 is the second color G, which is the same as the color of the mark 6 of the other electric wire 2. By forming the mark 21 in a same color as the mark 6 of the electric wire 2 attached to the male terminal 3 which is to be inserted into the terminal-receiving chamber 20 corresponding to the mark 21, the mark 21 indicates the male terminal 3 to be received by the terminal-receiving chamber 20 corresponding to the mark 21.