To provide a novel triazine derivative represented by the following formula (I): A triazine derivative represented by the following formula (I) : wherein R 1 represents a substituted or unsubstituted lower alkyl group, or a substituted or unsubstituted alkoxy group, Ar represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, either of Z 1 and Z 2 represents carbon atom and the other is nitrogen atom, or both of the Z 1 and Z 2 represent nitrogen atoms, Q is selected from a structure (a) and (b) described below: wherein R 2 represents a substituted or unsubstituted lower alkyl group, or a substituted or unsubstituted cycloalkyl group, R 3 represents a hydrogen atom or a halogen atom, Y represents a nitrogen atom or a carbon atom, and the bond drawn with a dotted line parallel to a solid line on structure (a) represents either double bond or single bond, or a pharmaceutically acceptable salt thereof.
