As much as any other academic degree...
Employers tend to not really care much what you studied, so much as just that you studied it (and maybe where). Unless you're trying to go into an area where a particular degree is necessary to work in that area (for example engineering) it's really irrelevant what you study, other than hopefully something you find interesting (and can do well in).
Psychology is not more or less employable than anthropology, archaeology, sociology, history, geography, Classics, philosophy, English literature, etc, etc, as a degree. Unless, per the above, you want to pursue a clinical psychology career, in which case as far as I'm aware a BPS accredited psychology course is a necessary prerequisite.