The contact potential difference this is the potential difference, which appears between the located in the electrical contact conductors under the thermodynamic equilibrium conditions. Between two conductors, led to the contact, occur the electron transfer, as a result of which they are charged (conductor with the smaller work function positively, and with larger - negatively) until electron streams in both directions are balanced also in the entire system the level of electrochemical potential (Fermi level) becomes identical. The established contact potential difference is equal to difference the work function of conductors, referred to the electron charge. But from the attention of researchers slipped off still one type of contact potential difference, which occurs with the flow of the current through the superconductors. This type of contact potential difference is examined in this article.