An imaging unit includes an attached portion which is detachably attached to an attaching portion disposed in a display apparatus including a display screen, an imaging main body portion which includes an imaging element, and a rotational mechanism which includes a rotational member formed as an arc-like portion, and connects the attached portion and the imaging main body portion such that the imaging main body portion is able to be rotated around a center of an arc of the arc-like portion as a rotational center in a direction in which an imaging direction is changed, in which when viewed from a direction in which a rotational axis of the imaging main body portion by the rotational mechanism is viewed as a point, the imaging main body portion is superposed on a circle which has the same center and the same radius as the arc of the arc-like portion.