Provided is a compound having an excellent JAK inhibitory activity and therefore useful as a prophylactic or therapeutic agent for autoimmune diseases (e.g. rheumatoid arthritis psoriasis inflammatory bowel disease Sjogrens syndrome, Behcets disease multiple sclerosis systemic lupus erythematosus) cancer (e.g. leukemia uterine leiomyosarcoma prostate cancer multiple myeloma, dyscrasia bone marrow fibrosis) or the like or a salt of the compound. The present invention relates to a compound represented by formula (I) [wherein each symbol is as defined in the description] or a salt thereof.
