The Main Auditorium has been a popular venue for meetings, congresses, festivities, concerts and events from the very beginning. The Auditorium seats 1700 people, 1200 in the stalls and 500 in the balcony. The floor is oak parquet and the blue sections of the wall are Finnish birch. The stage is 14 metres wide. It consists of several modular platforms. In the middle, there is an elevator to the storage rooms located on two floors underneath the stage. The curtain is designed by Dora Jung, a Finnish textile designer.