A pyrimidine derivative represented by Formula (I)
wherein Ar represents substituted or unsubstituted aryl, R
1
represents —NR
2
R
3
and wherein R
2
represents a hydrogen atom or substituted or unsubstituted lower alkyl and R
3
represents substituted or unsubstituted lower alkyl, substituted or unsubstituted aralkyl, A represents a single bond, Formula (III)
wherein m
1
is 0 to 2, n
1
is 0 to 4, a
1
is from 0 to a substitutable number, R
5
represents substituted or unsubstituted lower alkyl, and each R
5
may be the same or different when a
1
is 2 or more), and Q represents —NR
6
R
7
(wherein R
6
and R
7
may be the same or different and each represents a hydrogen atom, a substituted or unsubstituted heteroalicyclic group, a substituted or unsubstituted heteroalicyclic group, substituted or unsubstituted piperidin-4-ylamino, or quaternary ammonium salts thereof, or pharmaceutically acceptable salts thereof.