adverb, noun which may take the genitive case particle 'no'
that much; to that extent; that many
Kansai dialect form of あれだけ. Used adverbially or with の to modify a noun, expressing a large amount or degree, often with a nuance of surprise or emphasis.
See also: あれだけ
あんだけ食べたらお腹いっぱいやろ。
If you eat that much, you'll be full, right?
あんだけの人数が集まるとは思わんかった。
I didn't think that many people would gather.