A coating apparatus 10 includes a base 11, a substrate support stage unit 2 mounted on the base 11 and capable of fixedly supporting a substrate 1, a coating unit 3 mounted on the base 11 and capable of discharging a coating material onto a substrate 1 fixedly supported on the substrate support stage unit 2, and a motor unit 4 for driving at least either the substrate support stage unit 2 or the coating unit 3 for sliding on the base 11. The motor unit 3 has a stator assembly 22 on the base 11. The stator assembly 22 includes a plurality of magnets 31 linearly arranged such that opposite magnetic polarities of the magnets alternately change, and a pair of magnet holding members 37 and 38 for linearly pressing the magnets 31 together from both the ends of the magnets.