A support device for a wall mounted electronic device, comprising: a pair of support legs (12A. 12B) configured to be mounted to a side surface of a housing of the wall mounted electronic device to support the housing; a pair of fixing legs (10A, 10B) configured to be mounted to a mounting surface at which the housing is to be installed to fix the housing at a position at which the housing is to be installed; a movable mechanism configured to pivotably couple the pair of support legs (12A, 12B) and the pair of fixing legs (10A, 10B); and an angle-adjustment shaft mounted to a shaft mounting portion of one of the fixing legs (10A, 10B) on one side and to a corresponding one of the pair of support legs (12A, 12B) on the other side, wherein the angle-adjustment shaft adjusts an angle formed between the mounting surface and the housing mounted to the pair of support legs (12A, 12B) pivoted by the movable mechanism, wherein any one or both of the pair of support legs (12A, 12B) comprise a shaft fixing groove (121, 122) for fixing the housing by a specific angle, the angle-adjustment shaft is fixed to the shaft fixing groove (121, 122), to thereby fix the housing to the mounting surface by a specific angle, wherein each of the pair of support legs (12A, 12B) is a plate-shaped member formed in an L-shape, comprises a plurality of housing mounting holes (16A, 16B) arranged in a direction away from the mounting surface in a state in which the support legs (12A, 12B) are parallel with the mounting surface, wherein the housing mounting holes (16A, 16B) include: a first housing mounting hole positioned in the direction with a first distance from the mounting surface; and a second housing mounting hole positioned in the direction with a second distance from the mounting surface, and wherein the second distance is larger than the first distance. a pair of support legs (12A. 12B) configured to be mounted to a side surface of a housing of the wall mounted electronic device to support the housing; a pair of fixing legs (10A, 10B) configured to be mounted to a mounting surface at which the housing is to be installed to fix the housing at a position at which the housing is to be installed; a movable mechanism configured to pivotably couple the pair of support legs (12A, 12B) and the pair of fixing legs (10A, 10B); and an angle-adjustment shaft mounted to a shaft mounting portion of one of the fixing legs (10A, 10B) on one side and to a corresponding one of the pair of support legs (12A, 12B) on the other side, wherein the angle-adjustment shaft adjusts an angle formed between the mounting surface and the housing mounted to the pair of support legs (12A, 12B) pivoted by the movable mechanism, wherein any one or both of the pair of support legs (12A, 12B) comprise a shaft fixing groove (121, 122) for fixing the housing by a specific angle, the angle-adjustment shaft is fixed to the shaft fixing groove (121, 122), to thereby fix the housing to the mounting surface by a specific angle, wherein each of the pair of support legs (12A, 12B) is a plate-shaped member formed in an L-shape, comprises a plurality of housing mounting holes (16A, 16B) arranged in a direction away from the mounting surface in a state in which the support legs (12A, 12B) are parallel with the mounting surface, wherein the housing mounting holes (16A, 16B) include: a first housing mounting hole positioned in the direction with a first distance from the mounting surface; and a second housing mounting hole positioned in the direction with a second distance from the mounting surface, and wherein the second distance is larger than the first distance. a first housing mounting hole positioned in the direction with a first distance from the mounting surface; and a second housing mounting hole positioned in the direction with a second distance from the mounting surface, and wherein the second distance is larger than the first distance.