“It doesn't matter” in Japanese
Short answer
It doesn't matter in Japanese is “構へん” (kamahen). Full meaning: no problem, it doesn't matter.
Other ways to say “It doesn't matter” in Japanese
構わない
kamawanai no problem, it doesn't matter
構いません
kamaimasen no problem, it doesn't matter
こっちの話
kotchinohanashi matter being discussed (e.g. in a private conversation), it's not your business, it doesn't matter (to you), it's a private matter; our side of the story (in contrast to another's version)
苦しゅうない
kurushuunai no problem, no objection, it doesn't matter
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