Disclosed is a pyrazole compound which is 1-(1-ethyl-4-(3-(2-methoxyethoxy)-2-methyl-4- (methylsulfonyl)benzoyl)-1 H-pyrazol-5-yloxy)ethyl methyl carbonate or its salt which is depicted in the drawing as compound 2-1. Also disclosed is a herbicide comprising the pyrazole compound and a method for controlling undesired plants or inhibiting their growth, which comprises applying the compound to the undesired plants or to a place where they grow.