A slide rail device includes a track member, and a slider unit that includes a slider being slidable along the track member and having a recess which is cooperatively defined by two inner side faces and an inner connecting face connected between the inner side faces, and two block boards fixedly fastened to the inner connecting face. The slide rail device further includes a linear motor unit that includes a rotor connected to the inner connecting face and cooperating with the inner connecting face, the inner side faces and the block boards to define a filling space, and a heat dissipating member that fills the filling space, and that is seamlessly connected between the rotor and the slider unit.