A method for producing a pyridine compound of formula (II), comprising oxidizing a dihydropyridine compound of formula (I) in the presence of (i) at least one acid and at least one nitrous acid or a nitrite, or (ii) at least one base, and a hydrogen peroxide solution:
1
wherein in formulae (I) and (II), R
1
to R
5
represents a hydrogen atom, or a substituent; L represents an alkyl group, an alkoxy group, an aryl group, or an aryloxy group.