To provide an industrially advantageous method for producing an oxetane compound by dehydrohalogenating cyclization of 3-halo-1-propanols (or 3-chloro-1-propanol as one of them) of the formula (1) in high yield without the need of a two-layer system comprising water and an organic solvent.

The method for producing the oxetane compound comprises the dehydrohalogenating cyclization of the 3-halo-1-propanol of the formula (1) [wherein, R1 and R2 are each H, a (substituted) 1-8C (branched) aliphatic hydrocarbon group, or joined each other to form a bivalent 2-8C (branched) aliphatic hydrocarbon group; and X is Cl, Br or I] using a polyalkyl ether in the presence of an alkali.