This paper presents the findings of a survey carried out in 1991 on mounded tombs at the Maruyama shrine in Higashi-hiroshima, Hiroshima Prefecture. There are three mounds. The first is a zenpo-koenfun (前方後円墳; keyhole-shaped tomb), while the second and third are enpun (円墳; circular mounds). The approximate measurements for the tombs are as follows. The keyhole-shaped mounded tomb has a total length of 44.1m (restored length); the koenbu (後円部; rear circular part) has a diameter of 33m and a height of 6.5m, while the zenpobu (前方部; front part) has a length of 16.0m, a width of 14.2m, and a height of 1.8m. The second tomb has a diameter of 10 m and a height of 2 m. The third tomb has a diameter of 10.2m and a height of 1m. The first tumulus can be dated to between the early 5th century and the 4th century from the collection of the tsubogata-haniwa (壺形埴輪; pot-shaped clay figures). The first tomb is the third-largest in the Shiraichi and Saijo basin area, and is a very important mounded tomb in relation to the beginning of the Middle Kofun period in this region. In addition, I discuss the Yayoi pottery that has been collected around the Maruyama shrine.