This invention relates to an agent for inducing a callus comprising a compound represented by Formula (I) or a hydrolysis product of an amide bond thereof: wherein Ar1 represents phenyl substituted with substituent or substituents selected from alkoxy and methylenedioxy; Ar2 represents phenyl substituted with halogen; R1 and R2 each represent hydrogen, alkyl, cyano, or carboxyl; R1 and R2 may together form oxo; R3 to R10 each represent hydrogen or methyl; and R3 and R4, R5 and R6, R7 and R8, and/or R9 and R10 may together form oxo; a method for inducing a callus and a method for plant transformation using such agent for inducing a callus.