The present invention relates to an organic compound and an organic light emitting device comprising same, the organic compound being employed in a light efficiency improving layer, which is provided in an organic light emitting device, so as to increase the light efficiency of the device, and thus enables low-voltage driving of the device and excellent device characteristics such as excellent color purity and improved luminous efficiency to be implemented. Therefore, the present invention can be industrially and effectively used in various lighting and display devices and the like.