It depends on who is doing the recording. Chapter 24 of the penal code governs privacy and Section 5 therein outlaws eavesdropping, which includes third-party recording:
(1) A person who unlawfully listens to or records with a technical
(1)a discussion, talk or other sounds of private life, where these are not in tended for his or her knowledge, and which occur
or arise in domestic premises or
(2) in secret in other than in domestic premises, talk that is not intended to his or her knowledge or to the knowledge of third
parties in general, where the circumstances are such that the
speaker has no reason to believe that a third party is listening
shall be sentenced for eavesdropping to a fine or to imprisonment for
at most one year.
Otherwise, there is no requirement for all-party consent.