An electronic device comprising: an electronic device body including a settling part caved at a side of the electronic device body; a battery member comprising first and second hook members (210a, 210b) located at opposite sides thereof, received inside the settling part; a front member formed in the side of the electronic device body comprising: a first hook joining part located at a first side of the settling part and comprising a first joining groove caved from a side of the front member and configured to settle the first hook member inside and first joining projections protruding respectively from both sides of the first joining groove and configured to prevent separation of the first hook member from the first joining groove; and a second hook joining part located at a second side of the settling part and facing the first hook joining part, the second hook joining part comprising a second joining groove caved from an opposite side of the front member and configured to settle the second hook member inside and second joining projections protruding respectively from both sides of the second joining groove and configured to prevent separation of the second hook member from the second joining groove, wherein the first hook member is detachably coupled with the first hook joining part; the second hook member is detachably coupled with the second hook joining part; and the first joining projections of the first hook joining part are different, in size, from the second joining projections of the second hook joining part. an electronic device body including a settling part caved at a side of the electronic device body; a battery member comprising first and second hook members (210a, 210b) located at opposite sides thereof, received inside the settling part; a front member formed in the side of the electronic device body comprising: a first hook joining part located at a first side of the settling part and comprising a first joining groove caved from a side of the front member and configured to settle the first hook member inside and first joining projections protruding respectively from both sides of the first joining groove and configured to prevent separation of the first hook member from the first joining groove; and a second hook joining part located at a second side of the settling part and facing the first hook joining part, the second hook joining part comprising a second joining groove caved from an opposite side of the front member and configured to settle the second hook member inside and second joining projections protruding respectively from both sides of the second joining groove and configured to prevent separation of the second hook member from the second joining groove, wherein the first hook member is detachably coupled with the first hook joining part; the second hook member is detachably coupled with the second hook joining part; and the first joining projections of the first hook joining part are different, in size, from the second joining projections of the second hook joining part. a first hook joining part located at a first side of the settling part and comprising a first joining groove caved from a side of the front member and configured to settle the first hook member inside and first joining projections protruding respectively from both sides of the first joining groove and configured to prevent separation of the first hook member from the first joining groove; and a second hook joining part located at a second side of the settling part and facing the first hook joining part, the second hook joining part comprising a second joining groove caved from an opposite side of the front member and configured to settle the second hook member inside and second joining projections protruding respectively from both sides of the second joining groove and configured to prevent separation of the second hook member from the second joining groove, wherein the first hook member is detachably coupled with the first hook joining part; the second hook member is detachably coupled with the second hook joining part; and the first joining projections of the first hook joining part are different, in size, from the second joining projections of the second hook joining part.