Method for preparing pyrazole derivatives

[Chemical 1] The present invention relates to a compound of formula (I) wherein W is nitrogen or CR 1 ; R 1 , R 2 , R 4 and R 5 are each independently hydrogen, halogen, C 1 -C 6- Selected from alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, R 7 S (O) n , nitro, cyano and pentafluorothio; R 3 is Hydrogen, halogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, R 7 S (O) n , nitro, cyano, penta Fluorothio or phenyl, where the phenyl is unsubstituted or halogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, R 7 S (O) n , substituted with 1 to 5 members which are the same or different from the group consisting of nitro, cyano and pentafluorothio; and R 7 is , C 1 -C 6 -alkyl or C 1 -C 6 -haloalkyl; and n is 0, 1 or 2], wherein the method comprises: Hydrazine represented by the formula (II), wherein W, R 2 , R 3 , R 4 and R 5 are as defined for the pyrazole derivative represented by the formula (I) It is made to react with the compound represented by (III). [Selection figure] None