ても構わない【てもかまわない】

The expression ても構わない means "it doesn't matter if…", "I don't mind if…", or "it's okay to…". It combines the ～ても ("even if") form with かまわない構わない (the negative form of かまう構う, "to mind/care"), literally meaning "I don't mind even if…". It is used to express permission, tolerance, or indifference toward something happening.

Giving or expressing permission

ても構わない is used to indicate that something is acceptable or permissible. It is slightly more formal than ～てもいい and often appears in written language, business contexts, or polite conversation.

Expressing indifference or resignation

It can also express that the speaker genuinely does not care about a certain outcome – that it makes no difference to them either way.

Structure

• Verb[て] + も構わない: たべて食べてもかまわない構わない – it's okay to eat
• い-Adj → くても構わない: たかくて高くてもかまわない構わない – it doesn't matter if it's expensive
• な-Adj / Noun + でも構わない: かんたん簡単でもかまわない構わない – it doesn't matter if it's simple

Politeness

The polite form is ても構いません (using the ます-stem negative of かまう構う). In casual speech, ても構わない is used as-is. The expression is overall somewhat formal compared to 〜～てもいい, making it well-suited for workplace or written contexts.

Comparison with ～てもいい

Both ～てもいい and ～ても構わない express permission, but ～ても構わない carries a stronger nuance of "I really don't mind" or "it makes no difference to me". It can sound slightly more detached or matter-of-fact.