Objective: This study aimed to investigate whether the adult ADHD tendency group showed a perception bias for ambiguous facial expression stimuli and to determine the emotional priming effect in individuals. Methods: In Experiment 1, word stimulation of a single emotion category was used, whereas in Experiment 2, facial stimulation of a single emotion category was adopted to investigate whether the priming effect appeared in the emotion judgement of the ambiguous facial expression stimulation. The participants were college students who showed a high ADHD tendency on the CAARS-K. Results: In Experiment 1, the adult ADHD tendency group showed a slower time for priming stimulation than the control group. By contrast, Experiment 2 did not show any priming effects. Thus even if the prime-target emotions matched, emotion processing was not performed quickly. Conclusions: These results suggest that the adult ADHD tendency group differed in the emotional priming pattern compared with the control group. In addition, we suggests that the adult ADHD tendency group might be defective in decoding emotional facial expressions. Synthesizing the implications of the study, further discussions on the issue and future research directions are presented.