The present invention addresses the problem of providing a centrifugal smearing device and a sealed rotating container in which liquid components do not leak to an outside of the sealed rotating container. To solve this problem, in a centrifugal smearing device (30) including a sealed rotating container (34) that houses a chamber (10) with a slide glass removably attached for holding the liquid sample to smear cells in the liquid sample with a centrifugal force onto the slide glass, and a base (31) housing the sealed rotating container (34) and including rotational driving means (32) for rotating the sealed rotating container (34), the sealed rotating container (34) includes a main body (40) capable of housing the chamber (10) and a lid (42) for closing an upper surface opening portion of the main body (40), a seal portion (100) for sealing a space between the main body (40) and the end face of the upper face opening portion is provided on an outer circumferential edge of the lid, and a scattering protection wall (120) is formed at an inside of the seal portion (100) so as to protrude downward to hide the seal portion (100) from inside so that a liquid does not scatter onto the seal portion (100).