A compound represented by the formula [I]: ** Formula ** in which: R 1 is hydrogen, halogen, C 1-6 alkyl or cyano； Ring A is an optionally substituted heterocyclic group, in which the heterocyclic moiety in the "optionally substituted heterocyclic group" represented by Ring A is monocyclic or bicyclic heteroaryl containing 1 to 3 nitrogen atoms as heteroatom or a group having a 5 to 6-membered aliphatic ring fused to it, and in which the "optionally substituted heterocyclic group" represented by ring A is a heterocyclic group optionally substituted with 1 to 6 substituent (s) that are the same or different and selected from the group consisting of C1-6 alkyl； C3-8 cycloalkyl； halogen； halo-C1-5 alkyl； hydroxy； C1-6 alkoxy； C1-5 haloalkoxy； amino optionally substituted with 1 to 2 substituent (s) that are the same or different and selected from C1-6 alkyl and halogen； and cyclic amino optionally substituted with 1 to 3 substituents (s) that are the same or different and selected from C1-6 alkyl and halogen； Ring B is an optionally substituted 3 to 6-membered monocyclic group, in which the unicycle moiety in the "optionally substituted 3 to 6-membered monocyclic group" represented by Ring B is a 4-monocyclic nitrogen-containing heterocyclic group. to 6 members or 3 to 6 member monocyclic hydrocarbon group, and wherein the "optionally substituted 3 to 6 member monocyclic group" represented by ring B is a 3 to 6 member monocyclic group optionally substituted with 1 to 3 substituent (s) that are the same or different and selected from the group consisting of halogen； oxo； hydroxy； C1-6 alkyl optionally substituted with 1 to 2 substituent (s) that are the same or different and selected from hydroxy and C1-6 alkoxy； C1-6 alkoxy； C1-6 alkyl sulfonyloxy； and amino optionally substituted with 1 to 2 substituent (s) that are the same or different and selected from C1-6 alkyl； and Y is represented by the formula [III]: -Z-R2 [III] in which Z is -N (R3) -, -O- or C1-2 alkylene；
