The present invention addresses the problem of providing a novel compound which has a retinoid-related orphan receptor γ antagonistic activity and exhibits a therapeutic effect or a prophylactic effect on an autoimmune disease such as multiple sclerosis or psoriasis or an allergic disease such as an allergic dermatitis including contact dermatitis or atopic dermatitis. The present invention provides a cyclic amine derivative (I) typified by a compound shown below, or a stereoisomer of the derivative, or a hydrate of the derivative or the stereoisomer, or a pharmacologically acceptable salt of the derivative, the stereoisomer or the hydrate.