Structure
Noun + (なん) + だって
だって + Phrase
Details
Standard
About だって
だって is a colloquial combination of the auxiliary verb だ, and the adverbial particle とて in Japanese (a combination of the particles と, and て). It has a wide range of uses, but primarily exclaims that something is the 'premise' for whatever has been said, or will be said next. This 'exclamation' is usually translated as 'I heard', 'cause', 'but', or 'even if'. The meaning that will be conveyed is determined primarily by where だって appears in a sentence.
When placed at the beginning of a sentence, だって highlights the speaker's (usually) displeasure about something that has just been said, before following it with an explanation or counterpoint. This だって is quite similar to でも.
At the end of a sentence, だって is used to express hearsay, in a similar way to 'I heard that', or 'it was said that', in English. In these cases it will be preceded by なん. なんだって always appears after a noun, or a phrase that has been nominalized (with の or こと).
Caution
When used directly after a noun, だって has a similar nuance to the だって that appears at the beginning of sentences (emphasizing what has come before it, in order to explain further). This comes across as でも, and may not be used with なん.
Fun Fact
The adverbial particle とて itself is an abbreviation of expressions like と言って, and と思って. だとて (the full construction) may also be used, but is almost always replaced by だって, as it is far easier to say.
Fun Fact
When used at the beginning of a sentence, もん or もの will often come at the end of that sentence, in order to strengthen the opinion given by the speaker. This is more commonly used by women and children.
- 私もそんなもの食べたくないよ。だって、不味いもん。I also don't want to eat something like that. It's because it tastes bad.
-
今日は家から出ません。だって、今日は暑いもの。I am not going to leave my house today. Cause it is hot today.
Related
Vocab Coverage
All Bunpro Vocab that appears on this item.
Examples
--:--
全員合格だってよ。
It is said that everyone had passed the exam.
だって、全然知らないんだもん。
Because, I have no idea.
彼だって落ち込むこともあるよ。
Even he gets depressed from time to time.
「たけしさん、海外旅行だって?」
'Is it true (what I have heard) that Takeshi is on vacation abroad?'
月にだって行けるかもしれない。
You can probably even go to the moon.
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Using 「って」 or 「て」 for 「という」
Tae Kim
だって
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だって (datte) meaning
JStackExchange
んだって
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[AIAIJ] An Integrated Approach to Intermediate Japanese
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Tae Kim's Japanese Grammar Guide
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だって – Grammar Discussion
Most Recent Replies (28 in total)

The111
The red text at the bottom of the image below is not even accurate for that review. According to the red text, unless there is a noun preceding the だって, then it requires a なん before it. Obviously my understanding here sucks…
I guess it’s still attaching to the noun, it’s just sharing that attachment with the other particle に. But it’s hard for me to think of that as a “direct” attachment when there’s something in between them.EDIT: That was all wrong.I think this lesson is lacking. It does not explain the mechanics of why the phrase connects to “noun+particle” the way that this review question requires. The lesson explicitly talks about how different the semantics and syntax are for when it appears at the beginning vs the end of a sentence. But it doesn’t explain this third case where it’s in the middle, acting, apparently, as a particle… which I did not expect (I had to talk to an LLM to figure that part out).

ka5
This lesson mixes 3 very different uses, and 5 years ago there was an idea to split it (だって - Grammar Discussion - #9 by mrnoone)
To borrow a dictionary explanation (だって(ダッテ)とは? 意味や使い方 - コトバンク), the usage in the sentence 月にだって行ける, in the meaning of “even”, is a connecting particle (係助詞) like は・も・でも・から etc, and is used to provide an example:
[係助]
名詞・副詞、一部の助詞に付く。
「でも」に似るが、語調がより強い。
① ある事柄を例示し、それが他と同類、または、同様であるという意を表す。…もやはり。…でも。
「ここからだって見える」Connecting particles can follow not only nouns, but nouns with particles too, e.g. 誰でも・誰にでも.
だって in the beginning of a sentence is a conjunction (接続詞), and usually means なぜかというと.
だって at the end of a sentence is a sentence-ending particle (終助詞), and so it can be optionally combin...

cafelatte
splitting it would def help me, I still struggle with understanding だって