Grandma in Japanese is 祖母, said sobo. It pairs 祖, ancestor, nine strokes under the altar radical, with 母, mother, five strokes. Sobo is the word for your own grandmother when you speak to outsiders; to her face she is おばあちゃん (obaachan). Written in hiragana sobo is そぼ, and in katakana ソボ.
Grandma in Japanese
Grandma in Japanese is two words for one woman, and the one you use depends on who is listening.
A seven-year-old hears the doorbell on New Year’s Day and runs down the hall shouting おばあちゃん! (obaachan!), Grandma! Twenty years later, the same grandchild asks a manager for time off in August: お盆は祖母の家に帰ります (Obon wa sobo no ie ni kaerimasu), for Obon I am going back to my grandmother’s house. Same grandmother. Different word.
That is the rule underneath. Japanese speech sorts people into inside and outside, 内 (uchi) and 外 (soto). About your own family, to an outsider, you use plain, humble words: 祖母 (sobo), 母 (haha) for mother. To your family, or about someone else’s, you use the warmer words: おばあちゃん, おばあさん, お母さん. It is one small corner of keigo, the Japanese system of polite speech.
Sobo and Obaachan Meaning
Sobo (祖母) means grandmother, the mother of either of your parents. It sounds a little formal, the way “my grandmother” does in a job interview. To say which side, Japanese adds 母方の祖母 (hahakata no sobo), maternal grandmother, or 父方の祖母 (chichikata no sobo), paternal grandmother.
Obaachan (おばあちゃん) is the family word. It is お, an honorific, plus ばあ (baa), the old word for grandmother, plus ちゃん (chan), the affectionate suffix explained in our guide to Japanese honorifics. Swap chan for san and you get obaasan (おばあさん), a little politer and the standard word for someone else’s grandmother. The most respectful form is obaasama (おばあさま). Toddlers say ばあば (baaba).
All of these can also mean any elderly woman, so use them with care on a stranger. Nobody enjoys being promoted to grandmother by someone they have just met.
Two traps sit close by. Drop one beat and おばあさん becomes おばさん (obasan), an aunt or a middle-aged woman. The long vowel is the whole difference, so hold it. And ばばあ (babaa), with the long vowel moved to the end, is an insult, roughly “old hag.”
You may see お祖母さん for obaasan. It is correct but uncommon: the Jōyō table, Japan’s official list of everyday kanji, gives 祖母 no reading of obaa, so most writers use kana.
The Kanji for Grandma: 祖母
- Characters: 祖母, read そぼ (sobo)
- 祖: on’yomi ソ (so), with no kun’yomi on the Jōyō list; nine strokes; radical 礻 (altar), the narrow form of 示, Kangxi radical 113; taught in fifth grade
- 母: on’yomi ボ (bo); kun’yomi はは (haha); five strokes; radical 毋, Kangxi radical 80; taught in second grade
- General meaning: grandmother, the mother of either parent
- Related character: 婆 (ba, old woman), eleven strokes under 女, a Jōyō kanji with only the on’yomi バ
The Jōyō table also lists a traditional form of 祖, drawn with the full altar 示 on the left. That version has ten strokes, and the Unicode database counts 祖 as ten as well. The Japanese count for the modern form is nine.
Japanese Symbol for Grandma
Both halves of 祖母 still carry their pictures, and together they make a small family tree.
祖 is the altar radical 礻 beside 且. The altar marks words about gods, rites and offerings, the same 礻 that sits in 神 (kami), explained on god in Japanese. 且 supplies the sound so, and it began as a drawing of a stand on which offerings were laid. Altar plus offering stand gives you the honoured dead: 祖 means ancestor, as in 先祖 (senzo), ancestors, and 祖国 (sokoku), one’s homeland.
母 is 女, a woman, with two dots added for breasts. It is mother at its most literal.
Japanese once said grandmother more simply. The oldest native word was おおば (ooba), from おおはは (oohaha), big mother, and a legal commentary from 738 already glosses 祖父母 as ooji ooba, grandfather and grandmother. Over the centuries ooba wore down to oba and then uba, and in the Edo period ばば (baba) won out. That baba, softened, is the ばあ inside obaachan.
The Chinese-style word is just as old. The earliest example in the Nihon Kokugo Daijiten, Japan’s largest historical dictionary, is a leave request from 761, kept in the Shōsōin storehouse in Nara, asking for time off for a grandmother’s memorial rites. Thirteen centuries later, 祖母 is still the word for asking the boss for a day off.
How to Write 祖母 in Japanese
Fourteen strokes across the two characters: nine for 祖, five for 母.
祖 starts with the altar radical in four: a short dot at the top, a horizontal that turns sharply into a sweep down to the left like a small フ, a vertical straight down the middle, and a short dot to its right. Then 且 in five: the left vertical, the top and right side in one turning stroke, the two short horizontals inside, and last the long base stroke, which runs wider than the box above it.
母 takes five. The first stroke is the left side, coming down at a slight slant and turning right along the bottom. The second runs across the top and down the right side, finishing with a small hook. Then the two dots inside, upper first. The long horizontal through the middle comes last and reaches past the frame on both sides.
Watch the look-alikes. 祖 shares its right side with a family of characters read so: 租 (tax, with the grain radical), 粗 (coarse, with rice), 組 (kumi, a group, with thread) and 阻 (to block). Only the altar makes ancestor. And 礻 differs from 衤, the clothing radical, by a single short stroke. 母 has a near twin in 毎 (mai, every), which adds a short slanting stroke and a horizontal on top.
How to Say Grandma in Japanese
Sobo is two short, even beats, “soh-boh,” with both vowels clipped. Obaachan is five beats in Japanese counting, o-ba-a-cha-n: say “oh-bah-chahn” but hold the bah for two beats, and give the final n a small beat of its own. Obaasan works the same way, “oh-baa-sahn.”
Real sentences:
- 祖母は今年九十歳になります。(Sobo wa kotoshi kyuujussai ni narimasu.) My grandmother turns ninety this year.
- おばあちゃん、ただいま! (Obaachan, tadaima!) Grandma, I’m home!
- おばあさまはお元気ですか。(Obaasama wa ogenki desu ka.) Is your grandmother well?
- 母方の祖母は金沢に住んでいます。(Hahakata no sobo wa Kanazawa ni sunde imasu.) My maternal grandmother lives in Kanazawa.
- 夏休みはおばあちゃんの家に行く。(Natsuyasumi wa obaachan no ie ni iku.) I’m going to Grandma’s for the summer holidays.
Saying おばあちゃん about your own grandmother in a job interview sounds as young as “my granny” would.
Words and Compounds With 祖母
| Word | Reading | Meaning |
|---|---|---|
| 祖母 | sobo | grandmother, one’s own, said to outsiders |
| 祖父母 | sofubo | grandparents |
| 母方の祖母 | hahakata no sobo | maternal grandmother |
| 父方の祖母 | chichikata no sobo | paternal grandmother |
| 曽祖母 | sousobo | great-grandmother |
| ひいおばあちゃん | hii-obaachan | great-grandma, the family word |
| 老婆 | rouba | an old woman, in writing |
| 婆抜き | babanuki | Old Maid, the card game |
The last line deserves a story. The joker in that game is ばば, the old woman, and the loser is whoever is left holding her. Used figuratively, 婆抜き means people pushing an unwanted job onto each other until somebody gets stuck with it.
婆 hides in odder places. 湯湯婆 is read yutanpo, a hot-water bottle, because tan and po are borrowed Chinese readings of 湯 and 婆. And 娑婆 (shaba), this world of suffering, uses 婆 purely for its sound, to write a Sanskrit word. Neither has anything to do with grandmothers.
Grandma in Japanese Culture
Nearly every Japanese child knows the same opening line. むかしむかし、あるところに、おじいさんとおばあさんがいました. Once upon a time, in a certain place, there lived an old man and an old woman. The old man goes to the mountain to cut brushwood, the old woman goes to the river to do the washing, and a giant peach comes bobbing downstream toward her.
That is the start of Momotaro, the peach boy, and the mountain and river pairing is a standard storytelling opening used in other folk tales too. The oldest Edo-period picture books tell the peach part differently: the grandmother eats the peach, grows young again, and gives birth to the boy herself.
Real grandmothers have the numbers on their side. On September 1, 2026, Japan counted 107,677 people aged 100 or over, the first time the total passed 100,000, and 94,298 of them were women. That is close to nine in ten. In 1963, when the government began sending each new centenarian a letter from the prime minister, there were 153.
Grandmothers run through the calendar too. At New Year they hand out otoshidama, money in small decorated envelopes. And the soft あらあら of a grandmother noticing a spilled cup is the everyday home of ara ara, long before anime borrowed it.
As a Tattoo
Start with the plain fact: 祖母 is rarely a tattoo choice. It reads like the word on a form, the term a hospital or a family register uses, and alone on skin it looks like a label.
Most people who search for grandma as a tattoo want a memorial, and the honest advice is to choose something she would recognise. Her name in kanji or kana. A flower she grew, which you can find on flower in Japanese. A character for a quality she had, such as 心 (kokoro) from heart in Japanese. Those read as personal. 祖母 reads as paperwork. If you want the word itself, おばあちゃん in hiragana is warmer, though it sounds like a child talking.
Check the single characters. 祖 alone means ancestor or founder, and on a shop sign 元祖 means “the original.” 母 alone means mother, not grandmother. 婆 alone reads as old woman with an unkind edge, the 婆 of ばばあ. None of them is shorthand for grandma.
On script: 祖母 is written the same way in Japanese and in simplified and traditional Chinese, though older printing shows 祖 with the full altar 示. A Chinese reader will see the formal term, not the word for granny. Fourteen strokes is light work for an artist; give the narrow altar radical room at small sizes.
Confirm with a native speaker before you ink. You can preview the characters in vertical and horizontal layouts with the Japanese Tattoo Generator, and read the wider background in our guide to japanese tattoo meanings.
Related Kanji
For more characters about the people in your life, browse the kanji library.
Sources and Further Reading
- 常用漢字表 (Cabinet Notice No. 2 of 2010), Agency for Cultural Affairs the readings ソ for 祖, ボ and はは for 母, and バ for 婆, the bracketed traditional form of 祖, and no obaa reading for 祖母
- 祖 in KANJIDIC2, WWWJDIC, Electronic Dictionary Research and Development Group nine strokes, radical 113 and fifth-grade status
- 祖母, Digital Daijisen and Nihon Kokugo Daijiten (Kotobank) the 761 Shōsōin leave request, the 738 gloss, the ooba, oba, uba and baba history, and baba as the joker in Old Maid
- 桃太郎, Nihon Daihyakka Zensho (Kotobank) the mountain and river opening as a storytelling formula, and the Edo picture books in which the grandmother eats the peach and grows young
- 令和8年度百歳の高齢者へのお祝い状及び記念品の贈呈について, Ministry of Health, Labour and Welfare 107,677 centenarians on September 1, 2026, 94,298 of them women, 153 in 1963, and the prime minister's letter since 1963
FAQ
How do you say grandma in Japanese?
To her face, or inside the family, say obaachan (おばあちゃん). To mention your own grandmother to outsiders, say sobo (祖母). For someone else’s grandmother use obaasan (おばあさん), or obaasama when you want to be especially polite.
What is the difference between sobo and obaachan?
Who is listening. 祖母 (sobo) is the humble word for your own grandmother, used with a teacher, an employer or a doctor. おばあちゃん (obaachan) is what you call her and what the family says at home. The same rule gives 母 (haha) and お母さん (okaasan) for mother.
What is the kanji for grandma?
The kanji for grandma is 祖母, fourteen strokes. 祖, nine strokes, means ancestor and sits under the altar radical 礻. 母, five strokes, means mother and began as a woman drawn with two dots for breasts. Obaachan has no everyday kanji spelling; it is written in hiragana.
What is the difference between obaasan and obasan?
One long vowel. おばあさん (obaasan) holds the aa for two beats and means grandmother or an elderly woman. おばさん (obasan), with a short a, means aunt or a middle-aged woman. The same split separates おじいさん (ojiisan), grandfather, from おじさん (ojisan), uncle.
Is 祖母 the same in Chinese?
The characters are the same in Japanese and in simplified and traditional Chinese. The usage differs. In Mandarin, 祖母 (zǔmǔ) is formal and rare in conversation; people say 奶奶 (nǎinai) for a father’s mother and 外婆 (wàipó) or 姥姥 (lǎolao) for a mother’s mother.