noun
Refers to a person who visits a place to observe, such as a school open day, exhibition, or factory tour. Often used in formal or institutional contexts. Compare 参観者, which is more common.
See also: 参観者
授業参観には多くの参観人が訪れた。
Many visitors came to the class observation day.
展示会の参観人は予想以上に多かった。
There were more visitors to the exhibition than expected.
Compound of 参観 (sankan, 'visit for observation') + 人 (nin, 'person'). The exact historical derivation is uncertain, but the word follows a standard pattern for forming agent nouns.