This paper sought to examine in detail the rites of the final stages of the funeral rituals that took place at dolmens with surrounding stone platforms, by classifying and analyzing the artifacts excavated from these stone platforms. First, the artifacts and the contexts of their discovery were examined in order to see if traces of ritual could be identified from those artifacts excavated from stone platforms. As a result, in the case of the bottom part of coarse plain pottery, it was possible to confirm the presence of striking points, which were ‘⋃’-shaped, which extended from the center to the base of the vessel. In addition, it was possible to identify that polished stone daggers had been deliberately broken and the dagger body and hilt separately buried in the upper and lower parts of the stone platform. It could also be observed that, when found in association with settlements, the area where the artifacts were concentrated within the stone platform was located towards the direction of the residential spaces. It was interpreted that this phenomenon may be associated with the intention to prevent the sprit of deceased from returning to the realm of the living. Such a notion was thought to have originated from the perception of the people of the time who prayed for the deceased’s safe journey to the afterworld. Finally, the purpose the artifacts (prior to their destruction) during funeral rituals was considered. Coarse plain pottery accounted for the largest number of artifacts excavated from the stone platforms but a close examination of their form revealed that most of the vessels consisted of beaker-shaped pottery, which was most commonly used for cooking. With reference to the records on the funeral tradition of the Yayoi period, it was proposed that the ‘drink together and eat together (共飮共食)’ ritual may have taken place. It was therefore inferred that the artifacts excavated from the stone platform had been used in ‘drink together and eat together’ rituals prior to being destroyed. Based on the significance of the ritual, along with the fact that a large number of artifacts were found at such dolmens, it was recognized that the dolmens where such rituals had taken place could be distinguished from the other dolmens. It was suggested, by referring to ethnographic examples, that the rituals may have also been intended for differentiation from other family groups.