Kui Block Field, Mihara City, Hiroshima Prefecture, SW Japan is designated as a national natural monument. In this study, a checklist of the vascular plants recorded from Kui Block Field is provided, based on previous publications, herbarium specimens and our recent investigations. 415 species of vascular plants are recorded, consisting of 1 species of lycopods, 36 species of pteridophytes, 6 species of gymnosperms, and 372 species of angiosperms.