Masuiyama Daishirō is a former sumo wrestler and coach from Hyōgo, Japan. In 1980 he became the oldest wrestler to be promoted to the rank of ōzeki in the modern era. After retiring from active competition in 1981 he became a sumo coach and an elder of the Japan Sumo Association under the name Mihogaseki and produced several top division wrestlers as head of Mihogaseki stable before stepping down upon reaching age 65 in 2013. He is also an enka musician.