Device (1) suitable for measuring the brain activity signals of an individual said device being intended to be placed on the head of said individual and having a structure (2) intended to carry sensors said structure allowing the position of the sensors to be adjusted. According to the invention said structure of the device has: a deformable central support (2) which is able to adapt to the curvature of the head and is intended to be positioned along the head preferably on the median plane of the cranium flexible guides (3) which extend laterally with respect to said central support and are spaced apart from each other sensor supports (4 4) which are rigidly connected and fixed to said flexible guides (3) in adjustable positions along the flexible guides (3) and a system (5 6) for tightening said flexible guides.
