A 2,3-dihydro-1H-inden-2-yl urea derivative represented by the General Formula (Ia) or a pharmaceutically acceptable salt thereof: ** Formula ** wherein, n represents an integer from 0 to 4； R3a represents R6O- or (R6) 2N-； R3b represents hydrogen, R6O- or (R6) 2N-； R4a represents alkyl of 1 to 6 carbon atoms, R6O-, (R6) 2N- or halogen, in which the alkyl of R4a can be substituted with 1 or more halogens, R6O- and / or (R6) 2N-； R4b represents alkyl of 1 to 6 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, R6O-, (R6) 2N- or halogen, in which the alkyl of R4b can be substituted with 1 or more halogens, R6O- and / or (R6) 2N-, and in which the cycloalkyl of R4b can be substituted with 1 to 3 R6 which are each independent and / or 1 to 3 methylenes that constitute a ring that can each be replaced independently with -O-, - S -, - C (O) - or -N (R6) - and / or a carbon atom directly attached to a benzene ring can be replaced with a nitrogen atom； each R5 independently represents alkyl of 1 to 6 carbon atoms, R6O-, (R6) 2N-, R6C (O) NH-, R6S (O) 2NH-, R6C (O) -, R6OC (O) -, (R6 ) 2NC (O) cyano or halogen, in which the alkyl of R5 can be substituted with 1 or more halogens, R6O- and / or (R6) 2N-； each R6 independently represents hydrogen or alkyl of 1 to 6 carbon atoms, in which the alkyl of R6 can be substituted with 1 or more halogens, and X represents R6O- or (R6) 2N-.Un derivado de 2,3-dihidro-1H-inden-2-il urea representado por la Fórmula General (Ia) o una sal farmacéuticamente aceptable del mismo:**Fórmula** en la que, n representa un número entero de 0 a 4； R3a representa R6O- o (R6)2N-； R3b representa hidrógeno, R6O- o (R6)2N-； R4a representa alquilo de 1 a 6 átomos de carbono, R6O-, (R6)2N- o halógeno, en el que el alquilo de R4a puede sustituirse con 1 o más halógenos, R6O- y/o (R6)2N-； R4b representa alquilo de 1 a 6 átomos de carbono, cicloalquilo de 3 a 8 átomos de carbono, R6O-, (R6)2N- o halógeno, en el que el alquilo de R4b puede sustituirse con 1 o más
