A spray gun (31) is attached to a multi-function unit (32) movable in a horizontal direction and a perpendicular direction. The spray gun (31) is mounted to a support holder (33), and the support holder (33) is connected to a support arm (35) of the multi-function unit (32). The support arm (35) is attached to a unit cover (36) which is openable/closable with respect to a casing (2). The support holder (33) and the support arm (35) can hide and house a liquid hose and an air hose therein so that the hoses and the like are arranged in an apparatus in such a state as to be completely free from being exposed. An installation position of the spray gun (31) can be finely adjusted by the multi-function unit (32) during a coating process, thereby enabling a control for keeping constant distances between tablet surfaces and the spray gun (31).