Compound of the formula (I) or salt thereof: in the formula, R 1 is nitrogen-containing monocyclic aryl or heteroaryl, each of which may be substituted with group (s) selected from the group consisting of halogen, lower alkyl, -O-lower alkyl, halogen-lower alkyl, -O-halogen-lower alkyl, -CN, dimethylamino and cycloalkyl； X is CH, N or C； ** Formula ** is i) a single bond in the case where X is CH or N and ii) a double bond in the case where X is C； Y is a cyclic group described below: ** Formula ** in this case, Y1 is CRh or N, Y2 is CRi or N, provided that Y1 and Y2 are not N at the same time, Ra, Rh and Ri that are equal or different from each other are H or halogen, Rb is H or lower alkyl, Rc is lower alkyl, Y3 is CH or N, Rd and Re which are the same or different from each other are H or lower alkyl, Rf is H or lower alkyl, Y4 is O or S, Y5 is CH or N, Y6 is CH or N, Rg is H or lower alkyl； R2 is H or lower alkyl； R3 and R4 which are the same or different from each other are H, halogen, lower alkyl, -O-lower alkyl, halogen-lower alkyl, -O-halogen-lower alkyl, cycloalkyl, or -CN, or R3 and R4 can form 2 , 2-difluoro-1,3-benzodioxol binding together with the benzene ring to which R3 and R4 are attached； and lower alkyl is a linear or branched alkyl having 1 to 6 carbon atoms.Compuesto de la fórmula (I) o sal del mismo: en la fórmula, R1 es arilo o heteroarilo monocíclico que contiene nitrógeno, cada uno de los cuales puede estar sustituido con grupo(s) seleccionado(s) del grupo que consiste en halógeno, alquilo inferior, -O-alquilo inferior, halógeno-alquilo inferior, -O-halógeno-alquilo inferior, -CN, dimetilamino y cicloalquilo； X es CH, N o C； **Fórmula** es i) un enlace sencillo en el caso en el que X es CH o N y ii) un doble enlace en el caso en el que X es C； Y es un grupo cíclico descrito a continuación:**Fórmula** en este caso, Y1 es CRh o N, Y2 es CRi o N, siempre que Y1 e Y2 no sean N al mismo tiempo, Ra, Rh y Ri que son iguales o diferentes entre sí son
