A main object of the present invention is to provide a novel pyridine derivative represented by the following general formula [1] or a pharmaceutically acceptable salt thereof. In formula [1], R represents an aryl group or a heteroaryl group, which may be substituted by an optionally substituted alkyl group, a hydroxy group, a halogen atom or a group represented by general formula [2]. In formula [2], -L1-L2-L3-RA   [2] L1 and L3 independently represent a single bond, an alkylene group or a cycloalkylene group; L2 represents a single bond, O, or NRB; RB represents H or an optionally substituted alkyl group; and RA represents B, an amino group, a cyano group, a hydroxy group, an alkoxy group, an aryl group, a monoalkylamino group, a dialkylamino group, a carbamoyl group, an alkyloxycarbonyl group, a monoalkylaminocarbonyl group, a dialkylaminocarbonyl group, an alkylcarbonylamino group, and a saturated heterocyclic group, among other groups.