a second housing. A recess that has an independent space for each male terminal to limit creepage surface leakage current is formed on the first housing. A projection that is to be fitted into the recess is formed for each female terminal on the second housing. The connector joining device with the third constitution may include an electric connector including a first housing, an electric connector (coupler) including a second housing, a first sealing member, and a second sealing member. A recess having two male terminals together is formed on the first housing, and a projection that is to be fitted into the recess of the first housing is formed on the second housing. The first sealing member seals the two female terminals accommodated in the projection fromethanol 100 percent fuel serving as a medium of the leakage.
Particularly, if the positive terminal and the negative terminal coexist in the single recess formed on the first housing of the electric connector, a current path is formed via the alcohol blended fuel or the ethanol 100 percent fuel which has entered into the first housing along a bottom surface of the recess. As a result, electrochemical corrosion (electrolytic corrosion) is caused in both the terminals and eventually, break in electric continuity between each terminal of the electric connector and each terminal of the electric connector (coupler), or breakage is generated in the terminals. Such electrolytic corrosion is more easily produced as a distance between both the terminals which coexist in the recess on the first housing of