Provided is an organic light emitting display device capable of improving the accuracy of current measurement. The organic light emitting display device according to an embodiment of the present invention comprises: a display panel including first and second pixels each having an organic light emitting element; and a data driver including a first operational amplifier having a non-inverting terminal connected to a reference voltage terminal and an inverting terminal connected to the first pixel and a second operational amplifier having a non-inverting terminal connected to the reference voltage terminal and an inverting terminal connected to the second pixel. The first pixel includes: a sensing transistor having one electrode connected to the data driver and the other electrode connected to the organic light emitting element of the first pixel; a driving transistor having one electrode connected to a first power terminal and the other electrode connected to the other electrode of the sensing transistor; and a first switch transistor having one electrode connected to the data driver and the other electrode connected to a gate electrode of the driving transistor. The second pixel includes: a second driving transistor having one electrode connected to the first power terminal and the other electrode connected to the organic light emitting element of the second pixel; and a second switch transistor having one electrode connected to the data driver and the other electrode connected to a gate electrode of the second driving transistor.
