To provide a plug-in contact having good electrical contact, which can be adapted easily to distances to various contact members and can cope with a large capacity branching.

The plug in contact can branch a bus duct electrically by the plug in contact pressing in between contact members as electrically conductive members of a bus duct connection structure. Auxiliary member is disposed between facing spring strips and the electrically conductive spring strips are held between the contact member and the auxiliary member when the plug in contact is pressed in between the contact members. Using the electrically conductive auxiliary member makes it possible to carry out the large capacity branching satisfactorily due to the continuity of the auxiliary member.