A compound of formula (I) or a salt thereof, and medical use thereof (the symbols in the formula are as described in the specification). The compound of formula (I) has CCR4 antagonistic activity, and therefore is useful as a preventive and/or therapeutic agent for diseases associated with CCR4, i.e., CCR4-mediated diseases such as inflammatory and/or allergic diseases [e.g., systemic inflammatory response syndrome (SIRS), anaphylaxis or anaphylaxis-like reaction, allergic vasculitis, reject reaction for graft organ, hepatitis, nephritis, nephrosis, pancreatitis, rhinitis, arthritis, inflammatory ocular diseases, inflammatory bowel diseases, diseases in cerebro and/or circulatory system, respiratory diseases, dermatic diseases, autoimmune diseases, etc.], and the like.