Methods of coating a leading end part of a microneedle with a medical fluid all involve coating the medical fluid in an open system, making evaporation of a solvent from the medical fluid inevitable, and accordingly making it easy for the concentration of the medical fluid to fluctuate. A large quantity of the medical fluid is also required. It is difficult to use expensive drugs such as vaccines, proteins, or antigens in large quantities, however, and a method of coating a pinholder-type microneedle with a drug has been sought which uses a small quantity of solution and does not experience a fluctuation in medical fluid concentration. A member having a plurality of trenches is manufactured, one end whereof is immersed in a medical fluid tank, and the trenches filled with the medical fluid. It was discovered that setting such that pinholder-type microneedles pass through the medical fluid within the trenches allowed the leading end parts of the microneedles to be uniformly coated with the medical fluid. It is thus possible to provide a pinholder-type microneedle which can be uniformly coated with a medical fluid.Tous les procédés de revêtement de la partie avant dune microaiguille avec un fluide médical impliquent le revêtement du fluide médical dans un système ouvert, rendant inévitable lévaporation dun solvant du fluide médical, et facilitant ainsi la fluctuation de la concentration du fluide médical. En outre, une grande quantité du fluide médical est requise. Il est difficile dutiliser des médicaments onéreux tels que des vaccins, des protéines, ou des antigènes en grandes quantités. La présente invention concerne par conséquent un procédé de revêtement dune microaiguille de type à support daiguilles avec un médicament qui utilise une petite quantité de solution et durant lequel la concentration du fluide médical ne fluctue pas. Un élément ayant une pluralité de rainures est fabriqué et une de ses extrémités est immergée dans un récipient contenant le fluide méd
