The season started on 28 September 2017 and ended on 18 May 2018.
[1] Kataja Basket were the defending champions, but Kauhajoki Karhu achieved their first title ever.
Espoo United promoted from First Division and no team was relegated.
The quarter-finals and semi-finals were played in a best-of-three 1–1–1–1–1 format.
The finals were played in a best-of-seven playoff format.