mental hospital; psychiatric hospital; madhouse
Colloquial and somewhat dated term for a psychiatric hospital. Can carry a negative or stigmatizing tone, similar to 'madhouse' or 'loony bin' in English. The more neutral modern term is 精神科病院.
See also: 精神科病院
I heard that person is in a mental hospital.
In the past, the term 脳病院 was commonly used.