mental hygiene; mental health science
Academic field concerned with maintaining and promoting mental health; often used in public health and psychology contexts.
Mental hygiene is a field of study for protecting mental health.
He is majoring in mental health science at university.
Compound of 精神 (mind, spirit), 衛生 (hygiene, sanitation), and 学 (study, -ology). The term is a direct translation of the English 'mental hygiene', which was historically used before 'mental health' became more common.