Interrupting device and coupling device

A connection and disconnection device, comprising:

• an engagement element disposed between a first rotation member and a second rotation member;
• and
• an operation unit configured to operate the engagement element to be in an engagement state in which the first rotation member and the second rotation member are integrally rotatable or a non-engagement state in which the first rotation member and the second rotation member are relatively rotatable, wherein
• the operation unit includes
• an actuator configured to move the engagement element, and
• an operator configured to be able to operate the engagement element via the actuator or to be able to operate the engagement element not via the actuator,
• the first rotation member and the second rotation member are arranged such that
• rotation axes of the first rotation member and the second rotation member coincide with each other, and
• the first rotation member and the second rotation member at least partially overlap each other when viewed in an orthogonal direction orthogonal to the rotation axes,
• the operator includes
• an advancing and retracting element that is provided to be capable of advancing and retracting along the orthogonal direction orthogonal to the rotation axes, and
• an extension portion that extends along the rotation axes and is provided to be capable of advancing and retracting along the rotation axes, and
• the advancing and retracting element is provided such that an inner end thereof, which is an end on a side closer to the rotation axes in the orthogonal direction, is in contact with the extension portion.