A display device includes a first substrate and a second substrate. The first substrate includes a sealant which is formed on a peripheral area surrounding a display area including a plurality of pixel portions. The sealant includes a photocuring material hardened by multiphoton absorption and a thermosetting material hardened by heat. The second substrate faces the first substrate and is combined with the first substrate by the sealant. Thus, the reliability of manufacturing the display device, the display quality, and the productivity may be improved.