noun
permanent exhibition
Refers to a museum or gallery's permanent collection display, as opposed to a temporary special exhibition (企画展).
この美術館の常設展は入場無料です。
Admission to this museum's permanent exhibition is free.
企画展 is a temporary special exhibition, while 常設展 is the permanent collection display.
Compound of 常設 (permanent installation) and 展 (exhibition).