There is provided a case which accommodates an electronic device including a speaker, and a microphone. The case may incudes a first body, an accommodating part having a shape corresponding to a shape of the electronic device a second body provided on the first body so as to open or close the accommodating part, an internal speaker hole formed through the accommodating part, an external speaker hole formed through the first body, a speaker conduit formed in at least one of the first body and the accommodating part so as to connect the internal speaker hole and the external speaker hole, an internal microphone hole facing the microphone an external microphone hole formed through the second body, and a microphone conduit formed through the second body to connect the internal microphone hole and the external microphone hole.