An imaging module includes a first housing, a projection lens, elastic members and lock members. The first housing has a first combination part having first lock holes. The projection lens has a lens barrel and at least one lens disposed inside the lens barrel. The lens barrel has a plurality of connection parts extending outward. Each connection part has a second lock hole. The elastic members are disposed between each connection part and the first combination part. Each elastic member has a first surface leant against the corresponding connection part and a second surface leant against the first combination part. The first surfaces form a first datum plane. The connection parts lean against the first datum plane. Each lock member is inserted into the corresponding second lock hole, the corresponding first lock hole and the elastic member between the corresponding second lock hole and first lock hole.