Tsukuyomi: The Moon Kami in Japanese Mythology
Tsukuyomi (月読命), also written Tsukiyomi, is the kami most closely associated with the moon in Japanese mythology. Unlike his siblings Amaterasu and Susanoo, he appears in very few surviving stories. The accounts that do remain differ between the Kojiki and the Nihon Shoki, so it is useful to keep their versions distinct.
Who is Tsukuyomi?
Tsukuyomi is one of the three divine siblings linked with Izanagi’s purification after his return from the land of the dead. In the Kojiki, Tsukuyomi is born when Izanagi washes his right eye. Izanagi assigns him rule over the night. The same creation episode gives the sun to Amaterasu and the sea plain to Susanoo.
The Nihon Shoki preserves alternate accounts of the siblings’ origins. Some place Tsukuyomi’s birth in a different part of Izanagi’s purification, a reminder that early Japanese myth was recorded in more than one version. Read the connected stories in our guides to Izanagi, Amaterasu, and Susanoo.
Tsukuyomi and the story of Ukemochi
The Kojiki gives Tsukuyomi little further narrative after his birth. A different episode appears in an alternate account in the Nihon Shoki: Amaterasu sends Tsukuyomi to visit Ukemochi, a kami associated with food. Ukemochi prepares a feast by producing foods from her mouth. Tsukuyomi regards this as offensive and kills her. Amaterasu condemns his act and refuses to see him, and the two are thereafter separated—an etiological story explaining why the sun and moon occupy different times.
This episode is not presented identically in every early source, and it should not be summarized as a single universally agreed myth. The Kokugakuin University Digital Museum notes that the story appears in an alternate writing of the Nihongi, while its entry on Ukemochi describes her role as a food kami. The episode also connects Tsukuyomi to the wider importance of food and grain in Japanese sacred stories; see our article on Inari and rice-cultivation traditions.
Why is Tsukuyomi associated with the moon?
Tsukuyomi’s clearest mythic role is as the night or moon kami, paired with Amaterasu’s solar presence. The contrast between sun and moon helps the stories explain the rhythms of day and night, even though the sources say little about Tsukuyomi’s personality, worship, or adventures.
The name is written with characters associated with the moon and reading or seeing, but its precise etymology is debated. Scholars have proposed links between the name and observing or counting lunar time, but these should be treated as interpretations rather than settled fact. The Kokugakuin University Digital Museum entry on Tsukuyomi summarizes his recorded myths and the differing accounts.
What we know—and what the sources leave open
Because Tsukuyomi’s surviving stories are brief, many familiar details about the kami come from later interpretation, artistic imagination, or modern retellings. The early texts do not provide a long biography or a single consistent explanation for every aspect of the moon. Even Tsukuyomi’s gender is not explicit in every account; later interpretations commonly describe the kami as male, especially in relation to Amaterasu, while artistic depictions can vary.
The scarcity of stories is part of Tsukuyomi’s place in the mythology. He is central to the divine family that emerges from Izanagi’s purification, but most episodes focus instead on Amaterasu and Susanoo. That contrast makes him an intriguing figure: important in the cosmic order, yet mostly absent from the surviving narrative.
Frequently asked questions
Is Tsukuyomi the god of the moon?
Tsukuyomi is the kami most closely associated with the moon and night in Japanese mythology. The early sources offer only a small number of stories about him.
How was Tsukuyomi born?
In the Kojiki, he is born when Izanagi washes his right eye during purification. The Nihon Shoki also preserves alternate accounts of the divine siblings’ origins.
Did Tsukuyomi kill Ukemochi?
That story appears in an alternate account recorded in the Nihon Shoki. It is not part of the Kojiki’s main account, so the distinction between sources matters.
Tsukuyomi’s brief appearance in the chronicles leaves a striking image: the moon kami whose separation from the sun gives mythic form to night.
