An exemplary embodiment of the present disclosure provides a sensing device for measuring electroencephalogram (EEG). The sensing device includes an arm, a sensing portion, a multi-directional joint, a connecting base and a headband component. The arm has a front end and a back end opposite to the front end. The back end is coupled to the connecting base. The multi-directional joint is disposed on the front end, and coupled to the sensing portion, so that the sensing portion can rotate relative to the front end of the arm. The headband component includes a plurality of elastic arcuate bands and an anti-slip pad. Each of the elastic arcuate bands has a first side and a second side opposite to the first side. The first side is coupled to the anti-slip pad, and the second side is coupled to the connecting base.
