In some embodiments, a moving magnet type linear slider capable of eliminating a magnet suction force caused by a linear motor to minimize the linear guide friction is provided. The field of the linear motor includes magnet track having a horizontally arranged generally U-shaped magnetic yoke and plural pairs of field permanent magnets arranged on inner opposed surfaces of the magnetic yoke with polarities arranged alternately in a longitudinal direction of the magnetic yoke, each pair of the filed permanent magnets being arranged with opposite polarities faced with each other. The armature of the linear motor includes an armature holder mounted on the side portion of the fixed base in a vertically extended manner, and a planar coreless armature holder horizontally held by the armature holder. The stroke direction length Lmg of the magnet track is set to be longer than the stroke direction length La of the armature. Furthermore, a gravity compensation spring for compensating the weight of the movable unit is provided at the bottom portion of the magnet track so as to face the fixed base.