noun
hard case; hard-shell case
Refers to a protective case with a rigid outer shell, such as for glasses, musical instruments, or electronics.
メガネをハードケースに入れてカバンにしまった。
I put my glasses in a hard case and stowed them in my bag.
このギター用ハードケースは衝撃に強い。
This hard case for guitars is very shock-resistant.