Disclosed is a coating device which draws a pattern of a functional liquid on a substrate. The coating device includes: a substrate holding unit which holds the substrate; a droplet discharging unit which discharges a droplet of the functional liquid on the substrate held by the substrate holding unit; a moving unit which relatively moves the substrate holding unit and the droplet discharging unit in a main scanning direction and a sub scanning direction on a base; a mass measuring unit including a cup which receives the droplet discharged by the droplet discharging unit and a mass measuring device which measures a mass of the functional liquid accumulated in the cup; and a liquid drain unit which drains the functional liquid accumulated in the cup.