A centrifugal smearing device including a sealed rotating container that houses a chamber with a slide glass removably attached for holding a liquid sample to smear cells with a centrifugal force onto the slide glass, and a base housing the sealed rotating container and including rotational driving means for rotating the sealed rotating container, the sealed rotating container includes a main body capable of housing the chamber and a lid for closing an upper surface opening portion of the main body, a seal portion for sealing a space between the main body 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 is formed at an inside of the seal portion so as to protrude downward to hide the seal portion from inside so that a liquid does not scatter onto the seal portion.