An endoscope camera head comprising a first member and a second member that are capable of rotating relative to each other about a first axis (Ax1), wherein the first member has a first rotation-sliding surface that extends in an annular shape about the first axis as a center, the second member engages with the first rotation-sliding surface in a state in which movement to a direction of the first axis is restricted relative to the first member, and has a second-rotation sliding surface that rotation-slides relatively to the first rotation-sliding surface about the first axis, and the second rotation-sliding surface abuts only on a part of the first rotation-sliding surface, to expose a part of the first rotation-sliding surface outside; characterised in that : in the first member, a concave portion that extends in an annular shape about the first axis as a center is provided, the first rotation-sliding surface includes an inner surface of the concave portion, in the second member, a convex portion that extends in an annular shape about the first axis as a center, and that engages with the concave portion is provided, the second rotation-sliding surface includes an outer surface of the convex portion, and at a distal end of the convex portion, a groove portion that extends in a spiral shape about the first axis as a center, and respective parts of both end portions of which in a direction of the first axis are respectively positioned outside the concave portion is formed. a first member and a second member that are capable of rotating relative to each other about a first axis (Ax1), wherein the first member has a first rotation-sliding surface that extends in an annular shape about the first axis as a center, the second member engages with the first rotation-sliding surface in a state in which movement to a direction of the first axis is restricted relative to the first member, and has a second-rotation sliding surface that rotation-slides relatively to the first rotation-sliding surface about the first axis, and the second rotation-sliding surface abuts only on a part of the first rotation-sliding surface, to expose a part of the first rotation-sliding surface outside; characterised in that : in the first member, a concave portion that extends in an annular shape about the first axis as a center is provided, the first rotation-sliding surface includes an inner surface of the concave portion, in the second member, a convex portion that extends in an annular shape about the first axis as a center, and that engages with the concave portion is provided, the second rotation-sliding surface includes an outer surface of the convex portion, and at a distal end of the convex portion, a groove portion that extends in a spiral shape about the first axis as a center, and respective parts of both end portions of which in a direction of the first axis are respectively positioned outside the concave portion is formed. in the first member, a concave portion that extends in an annular shape about the first axis as a center is provided, the first rotation-sliding surface includes an inner surface of the concave portion, in the second member, a convex portion that extends in an annular shape about the first axis as a center, and that engages with the concave portion is provided, the second rotation-sliding surface includes an outer surface of the convex portion, and at a distal end of the convex portion, a groove portion that extends in a spiral shape about the first axis as a center, and respective parts of both end portions of which in a direction of the first axis are respectively positioned outside the concave portion is formed. <EOS>