1. A drawing apparatus comprising: a base coat information detecting section that detects, as base coat information, a contour of a base coat region which is formed on a surface of a drawing object by applying a first ink used for a base coat with a drawing tool so as to fill in a design region surrounded with a contour of a design image, before the design image is printed on the surface of the drawing object; a design adjusting section that adjusts a size of the design image and generates an adjusted design image which has a size sufficient to cover a whole area of the base coat region, based on the base coat information; and a print head that prints the adjusted design image on the base coat region so as to cover the whole area of the base coat region.