A fuel cell or electrolytic cell comprising: an element unit; and a conductive member, the conductive member being connected to the element unit and comprising: a base material containing chromium; and a covering part located on the base material, containing a first element selected from Ce, Eu, Pr, and Zr, and having a thickness of 150 nm or less, the conductive member comprising a first surface connected to the element unit, a second surface located away from the element unit, and a third surface that connects the first surface and the second surface, (i) wherein a first area ratio of the covering part located between the first surface and the base material is greater than a second area ratio of the covering part located between the third surface and the base material or (ii) wherein a first average thickness of the covering part located between the first surface and the base material is greater than a second average thickness of the covering part located between the third surface and the base material. an element unit; and a conductive member, the conductive member being connected to the element unit and comprising: a base material containing chromium; and a covering part located on the base material, containing a first element selected from Ce, Eu, Pr, and Zr, and having a thickness of 150 nm or less, the conductive member comprising a first surface connected to the element unit, a second surface located away from the element unit, and a third surface that connects the first surface and the second surface, (i) wherein a first area ratio of the covering part located between the first surface and the base material is greater than a second area ratio of the covering part located between the third surface and the base material or (ii) wherein a first average thickness of the covering part located between the first surface and the base material is greater than a second average thickness of the covering part located between the third surface and the base material. a base material containing chromium; and a covering part located on the base material, containing a first element selected from Ce, Eu, Pr, and Zr, and having a thickness of 150 nm or less, the conductive member comprising a first surface connected to the element unit, a second surface located away from the element unit, and a third surface that connects the first surface and the second surface, (i) wherein a first area ratio of the covering part located between the first surface and the base material is greater than a second area ratio of the covering part located between the third surface and the base material or (ii) wherein a first average thickness of the covering part located between the first surface and the base material is greater than a second average thickness of the covering part located between the third surface and the base material. (i) wherein a first area ratio of the covering part located between the first surface and the base material is greater than a second area ratio of the covering part located between the third surface and the base material or (ii) wherein a first average thickness of the covering part located between the first surface and the base material is greater than a second average thickness of the covering part located between the third surface and the base material.