A device for prevention of snoring in the form of a neck collar (1) with a middle section (2) for placement under the chin of a user, side sections (3, 4) connecting to said middle section and end parts (5, 6), optionally connectable to each other, consisting of a core of foam plastic contained in a covering. The foam plastic is a soft foam plastic, an opening (7) is formed in said middle section (2) and resilient means (14; 15; 27; 28) for adjustment of the height of the opening (7) and thereby the height of the middle section (2) are arranged in said opening (7).