A circuit substrate module includes: a plurality of substrates which are arranged in a matrix, and on at least some of which circuit components are mounted; a plurality of first flexible substrates each of which is arranged between two adjacent substrates in a row direction among the plurality of substrates, and connects the two adjacent substrates; and a plurality of second flexible substrates each of which is arranged between two adjacent substrates in a column direction among the plurality of substrates, and connects the two adjacent substrates.