Clamp sensor and measuring device

A clamp sensor comprising:

• a first core member constituting a part, in a circumferential direction, of a magnetic core arranged annularly in a closed state, and a second core member formed separately from the first core member, the second core member constituting another part, in the circumferential direction, of the magnetic core;
• and
• a first case accommodating the first core member, and a second case configured to be slidable relative to the first case and accommodating the second core member,
• wherein
• when the magnetic core is transitioned to the closed state and arranged annularly, and the magnetic core is viewed along an insertion direction of a detection target conductor with respect to the magnetic core, the second case is configured to be slidable relative to the first case along a virtual straight line intersecting an inner circumferential side edge portion of the magnetic core at either of both of end portions, in the circumferential direction, of the first core member,
• a first protruding portion protruding in the circumferential direction is provided at at least one end portion, of both the end portions in the circumferential direction of the first core member, and a second protruding portion protruding in the circumferential direction is provided at at least one end portion, of both of end portions in the circumferential direction of the second core member, and
• in the state in which the magnetic core is transitioned to the closed state and arranged annularly, the first protruding portion and the second protruding portion are configured to overlap each other in the insertion direction.