The present invention provides a composition for subcutaneous injection containing microparticles comprising finasteride, the composition comprising: microparticles comprising finasteride and biodegradable polymer； and a suspension solvent. The composition for subcutaneous injection of the present invention is provided in a subcutaneously injectable form, not in an oral administration form, and thus there is no need for a user to store the composition, and a hair loss treatment effect by finasteride can be exhibited through a method of direct administration at a hospital, and thus ease of storage and handling is excellent. When microparticles comprising finasteride are administered using the composition for subcutaneous injection of the present invention, a long-term drug administration effect over a period of 1-3 months can be maintained. In addition, in the present invention, as the diameter of particles is formed to a uniform micro-size, the release of a drug from microparticles is controlled, thereby enabling an effective drug concentration to be constantly maintained, and the present invention can be provided as a composition for injection, in which, when applied to an injection consisting of a uniform size of particles and administered as an injection to a patient, the sense of foreign matter and pain are reduced.La présente invention concerne une composition pour injection sous-cutanée contenant des microparticules comprenant du finastéride, la composition comprenant : des microparticules comprenant du finastéride et un polymère biodégradable； et un solvant pour suspension. La composition pour injection sous-cutanée de la présente invention est fournie sous une forme injectable par voie sous-cutanée, non sous une forme d'administration par voie orale, et un utilisateur n'a donc pas besoin de ranger la composition, et un effet de traitement de perte de cheveux par finastéride peut être présenté par l'intermédiaire d'un procédé d'administration directe à l'hôpi
