Electronic device module

An electronic device module comprising:

• a metallic casing having at least one boss formed therein;
• an electronic device unit placed inside the casing;
• connector terminals for external device connection electrically connected to the electronic device unit and used to connect the electronic device unit to an external device;
• and
• a metallic ground shell disposed so as to surround the connector terminals for external device connection, having a front surface covered with a metal coated layer and including at least one boss insertion portion formed so as to correspond to the at least one boss of the casing;
• wherein the at least one boss has a head exposed on the front surface of the ground shell covered with the coated layer upon insertion of the at least one boss into the at least one boss insertion portion corresponding to the at least one boss, and
• wherein the head of the at least one boss being inserted into the at least one boss insertion portion corresponding to the at least one boss, and the coated layer positioned on a periphery of the at least one boss insertion portion corresponding to the at least one boss are welded to each other to electrically connect and fix the ground shell to the casing.