To provide a novel triazine derivative represented by the following formula (I):A triazine derivative represented by the following formula (I) :whereinR1 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 Z1 and Z2 represents carbon atom and the other is nitrogen atom, or both of the Z1 and Z2 represent nitrogen atoms,Q is selected from a structure (a) and (b) described below:wherein R2 represents a substituted or unsubstituted lower alkyl group, or a substituted or unsubstituted cycloalkyl group,R3 represents a hydrogen atom or a halogen atom,Y represents a nitrogen atom or a carbon atom, andthe 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.
