An imaging apparatus with a rotatable lens barrel includes the following elements. An optical block includes a lens. An imaging block includes an imaging device. The lens barrel receives the respective blocks and includes a rotating truncated ball larger than a hemisphere of a virtual sphere formed by extending the curved surface of the truncated ball. A mount rotatably holds the lens barrel. The mount includes a support and a retainer. The support has a circular hole with a diameter smaller than that of the truncated ball and holds the ball such that the ball is fitted in the hole. The retainer has a circular opening with a diameter smaller than that of the truncated ball and holds the ball in the opening so as to prevent the lens barrel from coming out. At least part of the optical block is located within the virtual sphere.