Provided is a novel JAK3 inhibitor useful as a preventive and/or therapeutic agent for organ transplant rejection, graft versus host disease (GvHD), rheumatoid arthritis, multiple sclerosis, systemic lupus erythematosus, Sjogren’s syndrome, Behcet's disease, type I diabetes mellitus, autoimmune thyroiditis, idiopathic thrombocytopenic purpura, ulcerative colitis, Crohn's disease, asthma, allergic conjunctivitis, atopic dermatitis, contact dermatitis, urticaria, eczema, psoriasis, allergic conjunctivitis, uveitis, cancer, leukemia, etc. A pyridine-3-carboxyamide derivative represented by general formula (1) or a salt thereof or a solvate thereof.
