A mobile terminal comprising: a display unit; a bezel member configured to accommodate the display unit therein; the mobile terminal further comprising: a first side key including: a head part exposed at a lateral side of the bezel member; a penetrating part (216; 316; 416) extending into the bezel member; a guide recess formed on a side of the head part of the first side key facing the bezel; and an auxiliary guide recess formed on the side of the head part of the first side key facing the bezel, the guide recess being located between the penetrating part and the auxiliary guide recess; a loading member provided at the bezel member, the loading member having a loading recess configured to receive the head part of the first side key therein; a bushing member connected to the bezel member, the bushing member attaching the loading member to the bezel member, and an upper part of the bushing member inserted into the guide recess; a guide bar located at a bottom surface of the loading recess of the loading member, the guide bar being configured to be received in the auxiliary guide recess; and an elastic member (220; 320; 420) provided within the bushing member configured to provide an elastically repulsive force toward the head part of the first side key, wherein the bezel member includes a hole configured to secure the bushing member. wherein cooperation of the guide recess and the upper part of the bushing member is configured to guide displacement of the head part of the first side key; wherein the first side key is adapted to provide input to the mobile terminal by pressurizing or touching a topside of the head part of the first side key by a user. a display unit; a bezel member configured to accommodate the display unit therein; the mobile terminal further comprising: a first side key including: a head part exposed at a lateral side of the bezel member; a penetrating part (216; 316; 416) extending into the bezel member; a guide recess formed on a side of the head part of the first side key facing the bezel; and an auxiliary guide recess formed on the side of the head part of the first side key facing the bezel, the guide recess being located between the penetrating part and the auxiliary guide recess; a loading member provided at the bezel member, the loading member having a loading recess configured to receive the head part of the first side key therein; a bushing member connected to the bezel member, the bushing member attaching the loading member to the bezel member, and an upper part of the bushing member inserted into the guide recess; a guide bar located at a bottom surface of the loading recess of the loading member, the guide bar being configured to be received in the auxiliary guide recess; and an elastic member (220; 320; 420) provided within the bushing member configured to provide an elastically repulsive force toward the head part of the first side key, wherein the bezel member includes a hole configured to secure the bushing member. wherein cooperation of the guide recess and the upper part of the bushing member is configured to guide displacement of the head part of the first side key; wherein the first side key is adapted to provide input to the mobile terminal by pressurizing or touching a topside of the head part of the first side key by a user. a first side key including: a head part exposed at a lateral side of the bezel member; a penetrating part (216; 316; 416) extending into the bezel member; a guide recess formed on a side of the head part of the first side key facing the bezel; and an auxiliary guide recess formed on the side of the head part of the first side key facing the bezel, the guide recess being located between the penetrating part and the auxiliary guide recess; a head part exposed at a lateral side of the bezel member; a penetrating part (216; 316; 416) extending into the bezel member; a guide recess formed on a side of the head part of the first side key facing the bezel; and an auxiliary guide recess formed on the side of the head part of the first side key facing the bezel, the guide recess being located between the penetrating part and the auxiliary guide recess; a loading member provided at the bezel member, the loading member having a loading recess configured to receive the head part of the first side key therein; a bushing member connected to the bezel member, the bushing member attaching the loading member to the bezel member, and an upper part of the bushing member inserted into the guide recess; a guide bar located at a bottom surface of the loading recess of the loading member, the guide bar being configured to be received in the auxiliary guide recess; and an elastic member (220; 320; 420) provided within the bushing member configured to provide an elastically repulsive force toward the head part of the first side key, wherein the bezel member includes a hole configured to secure the bushing member. wherein cooperation of the guide recess and the upper part of the bushing member is configured to guide displacement of the head part of the first side key; wherein the first side key is adapted to provide input to the mobile terminal by pressurizing or touching a topside of the head part of the first side key by a user.