He completed his studies in philosophy at the Keio University of Tokyo and in Theology at the St. Sulpizio Seminary in Fukuoka, Japan.

[1][2] Bishop Moriyama was ordained a priest on 21 March 1988, incardinated in the Roman Catholic Diocese of Fukuoka.

[1][2] On 5 April 2022, Pope Francis appointed Moriyama as bishop of the Roman Catholic Diocese of Oita.

[4] He was Ordained a bishop on 3 July 2022 by Peter Michiaki Nakamura.

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