The present invention provides novel compounds having a P2X3 and/or P2X2/3 receptor antagonistic effect, e.g. a compound of Formula (I):whereinR2 is a hydrogen atom or the like；ring A is five- to seven-cycloalkane or the like；C is a carbon atom；Q1 and Q2 are carbon atoms or the like；R9a and R9b are carbon atoms or the like；R6 is cycloalkyl or the like；R7 is a group represented by the formula:whereinring D is benzene or the like；carbon atom a and b are carbon atoms；ring B is an aromatic carbocyclic ring or the like；s and s′ are 0 or the like；R9 and R9′ are halogen or the like,or the like,or its pharmaceutically acceptable salt.
