The present invention relates to a compound represented by formula (1): the compound having antagonist activity against serotonin 5-HT2A receptors and serotonin 5-HT7 receptors; or a pharmaceutically acceptable salt of the compound. (In the formula, Z is a nitrogen atom and the like; Y is carbonyl and the like; m and n are 1 and the like; R1a through R1d, R2a through R2d, and R4a through R4d are a hydrogen atom and the like; R3 is alkyl and the like; and Q is a specific bicyclic group.)