An angle adjuster for a music stand includes: a pair of thick portions having a thickness equivalent to a thickness of a two-fold hinge in a folded state and arranged to be mutually parallel; and an intermediate portion arranged between the pair of thick portions and recessed relative to upper surfaces of the thick portions perpendicular to a thickness direction thereof. The intermediate portion includes a plurality of catching portions provided mutually parallely along a longitudinal direction of the thick portions, each of the catching portions being configured to catch one end of a support bar to support the music stand.