[Problem] To provide a novel triazine derivative. [Solution] A triazine derivative or pharmaceutically acceptable salt thereof represented by formula (I). (In the formula: R1 represents a lower alkyl group which may have a substituent group, or an alkoxy group which may have a substituent group； Ar represents an aryl group which may have a substituent group, or a heteroaryl group which may have a substituent group； one of Z1 and Z2 represents a carbon atom, while the other represents a nitrogen atom, or both simultaneously represent nitrogen atoms； Q represents a structure selected from the structure (a) and the structure (b)； R2 represents a lower alkyl group which may have a substituent group, or a cycloalkyl group which may have a substituent group； R3 represents a hydrogen atom or a halogen atom； Y represents a nitrogen atom or a carbon atom； and the double line comprising a dotted line and a solid line in the structure (a) represents a double bond or a single bond.)
