Presented paper deals with the effect of positive emotions arousal on working memory performance. This subject is interesting, among other things, because research in this area comes to contradictory findings. Neuropsychological theory by Ashby et al. (1999) proposes that positive emotions with lower level of arousal facilitate working memory performance, whereas positive emotions with higher level of arousal decrease this performance. These assumptions were tested on a sample of 52 participants, who were randomly divided into 3 groups. In group 1, positive emotions with lower level of arousal were evoked, in group 2 positive emotions with higher level of arousal were evoked, and group 3 was a control group. Emotional states were induced using presentation of images from database International affective picture system (Lang et al., 2008), which was followed by administration of working memory test, the 2-back task. Whether emotional states induction was successful, was verified by a questionnaire that participants filled out immediately after testing. Results suggest that targeted emotional states were not invoked. The analysis further showed that there is no statistically significant difference in working memory performance between the groups.