Provided is a compound, or a salt thereof, that has an excellent PKC inhibitory action, and that is useful as a prophylactic or therapeutic agent for immunological diseases, inflammatory diseases, etc. A compound represented by formula (I) (the symbols in the formula are as described in the Specification), or a salt thereof, has an excellent PKC inhibitory action, and is useful as a prophylactic or therapeutic agent for immunological diseases, inflammatory diseases, etc.