A linear actuator comprising: a driving part composed of a magnet rodless cylinder, a sliding table that moves under the driving of the driving part, a guide rail for guiding the sliding table in a straight line, and first ends respectively connected to the driving part and a pair of end blocks at the second end, wherein: the guide rail is installed in the groove of the sliding table, and the dimension of the guide rail along the width direction substantially perpendicular to the moving direction of the sliding table is smaller than the width of the sliding table.
