To provide a novel pesticide. The present invention provides a pesticide which contains, as an active ingredient, novel pyridine derivative represented by the formula (I) or its salt: wherein R1 is alkyl, cycloalkyl, alkoxyalkyl or OR3； R2 is 1H-1,2,4-triazol-1-yl which may be substituted, 1H-imidazol-1-yl which may be substituted, 1H-1,2,3-triazol-1-yl which may be substituted, or 4H-1,2,4-triazol-4-yl which may be substituted； X is alkyl which may be substituted, cycloalkyl which may be substituted, halogen, nitro, etc.； R3 is alkyl which may be substituted, cycloalkyl which may be substituted, alkenyl which may be substituted, alkynyl which may be substituted, etc.； m is an integer of from 1 to 4.
